{"title":"IAG Cylinder Heads \u0026 Case Halves - FEATURED","description":null,"products":[{"product_id":"iag-800-fa20-closed-deck-case-half-set-for-13-20-subaru-brz-13-16-fr-s-17-20-86","title":"IAG 800 FA20 Closed Deck Case Half Set for 13-20 Subaru BRZ, 13-16 FR-S, 17-20 86","description":"\u003ch2 style=\"text-align:center;\"\u003eIAG 800 FA20 CLOSED DECK CASE FOR BRZ\/FRS\/GT86\u003c\/h2\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cimg alt=\"IAG 800 FA20 Closed Deck Case\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-869.jpg\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePLANNING TO BUILD YOUR OWN ENGINE? START HERE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eIt's no secret that the OEM Subaru case halves, or \"block,\" aren't exactly the strongest. IAG has developed a process to greatly improve the strength of the OEM Subaru FA20 Case Halves to combat the effects of high cylinder pressures brought on by increased power and boost. Our proprietary \"Closed Deck\" System works by supporting the top of the cylinder in the weakest areas and prevents movement and expansion which can lead to cracks and failures. Despite the additional material supporting the cylinder walls, there is no concerns with overheating or coolant flow because the area around the middle of the cylinder still maintains the same coolant area. The custom IAG closed deck inserts are machined with holes for oil and coolant to pass through the same as stock. Each IAG 800 FA20 BRZ\/FRS\/GT86 Case includes machining for 1\/2\" head studs and a cylinder gasket \"o-ring\" groove to aid in head gasket sealing. If you're one of those people who prefer to do your own builds we now offer our legendary closed deck case halves for purchase separately. Simply install your crank, rods, and pistons to your own specifications and be confident that the case halves will take the power and prevent common cylinder wall failures.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"IAG 800 FA20 Closed Deck Case Machining\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-870.jpg\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eTHE IAG CLOSED DECK PROCESS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG Closed Deck conversion is performed 100% in-house by our engineers and experts using state-of-the-art equipment. The IAG Closed Deck starts with a new OEM FA20 bare case. The case is loaded and fixtured to a 4th axis rotary indexer in our Haas VF4-SS CNC Vertical Machining Center. It is supported by the main journals using a precision ground 2-inch bar and tailstock which ensures the datum is the main journals. This method gives us a true reference point to perform all machining operations. A Rennishaw probe is utilized to check that the case is fixtured true, and once confirmed the machining process begins. \u003cbr\u003e\u003cbr\u003eOnce the case is fixtured, the first step is to mill out pockets for CNC inserts. Rather than attempting to install inserts into an inconsistent cast case, the pockets are milled out to exact dimensions creating a consistent area that accepts our precision inserts. Once the pockets are machined, the case is removed from the mill and placed into a block oven at a low temperature. Our pre-machined closed-deck inserts are simultaneously chilled using dry ice. When the case and inserts have reached our desired temperature, they are moved into our install station, which holds the block and lightly presses the inserts into position on one side of the deck surface. This process is repeated on the other side and then the partially completed case is moved to a cooling rack. In the next step of our process, the case is loaded and fixtured back into the VF-4SS after reaching room temperature. During this stage, the flanges left from machining the inserts are milled close to the case deck surface. Features such as coolant passages and case bolt access positions are machined. Finally, each deck surface is machined true and flat using a Poly Crystal Diamond insert.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"IAG 800 FA20 Closed Deck Case CNC Inserts\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-873.jpg\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eSPECIALLY DESIGNED INSERTS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eOur machining process converts the FA20's open deck to a complete closed deck and features the use of cast insert material that closely matches the metallurgy of the aluminum case material in a factory Subaru FA engine block. By using a similar cast material (rather than billet), we ensure that during expansion and contraction the materials grow and shrink at similar rates, which is vital for maintaining roundness within the top of the bore. The inserts are machined from ¾\" cast material. Once the deck is surfaced, the result is a true ½ inch finished insert thickness.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"O-Ring Wire\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-874.png\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eO-RING GROOVE \u0026amp; 1\/2\" HEAD STUDS FOR HEAD GASKET RELIABILITY\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eEach IAG 800 Closed Deck FA20 BRZ\/FRS\/GT86 Case includes extra machining to ensure reliability of the cylinder head gaskets. During the maching processeach case gets drilled and tapped to accept 1\/2\" Head Studs (Sold Separately.) Along with the upgraded head studs, a receiver groove is machined into the surface of the deck to accept an \"o-ring\" wire. When installed, the \"o-ring\" stands slightly above the deck and provides extra tension on the head gasket to seal combustion.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Case Half Sets Bored and Honed in IAG's Sunnen SV-30\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-875.jpg\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eFINAL BORE AND HONE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eEvery IAG Closed Deck case must be bored and honed after the closed deck process. During the closed deck process the cylinder walls become slightly distorted and an overbore must be performed to the correct this distortion and prepare the block to accept new pistons. FA20 Case Halves must use 86.1mm pistons. IAG offers the Bore and Hone service with each of our closed deck case halves. When selected, the case half set is fitted with custom deck plates and bored and honed in our state-of-the-art Sunnen SV-30 Computer Controlled Cylinder Hone. \u003cstrong\u003eYOU MUST PURCHASE OR SEND IN YOUR PISTONS FOR MEASUREMENT AND SIZING IF YOU SELECT THE BORE AND HONE OPTION.\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePOWER RATING\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003ePower:The IAG 800 Closed Deck Case has a power output rating of 800 BHP\u003c\/p\u003e\u003c\/div\u003e","brand":"IAG Performance","offers":[{"title":"Yes, Bore and Hone My Block (I Will Provide Pistons)","offer_id":48059098792154,"sku":"IAG-ENG-C886BH","price":3399.99,"currency_code":"USD","in_stock":true},{"title":"No","offer_id":48059098824922,"sku":"IAG-ENG-C886","price":3099.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/IAG-ENG-C886BH-01__55812.1678796913.1280.1280.jpg?v=1781530160"},{"product_id":"iag-800-fa20-dit-closed-deck-case-half-set-for-2015-21-subaru-wrx","title":"IAG 800 FA20 DIT Closed Deck Case Half Set for 2015-21 Subaru WRX","description":"\u003ch2 style=\"text-align:center;\"\u003eIAG 800 FA20DIT CLOSED DECK CASE FOR 2015-2021 SUBARU WRX\u003c\/h2\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cimg alt=\"AG 800 FA20DIT Closed Deck Case\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-876.jpg\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePLANNING TO BUILD YOUR OWN ENGINE? START HERE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eIt's no secret that the OEM Subaru case halves, or \"block,\" aren't exactly the strongest. IAG has developed a process to greatly improve the strength of the OEM Subaru FA20 Case Halves to combat the effects of high cylinder pressures brought on by increased power and boost. Our proprietary \"Closed Deck\" System works by supporting the top of the cylinder in the weakest areas and prevents movement and expansion which can lead to cracks and failures. Despite the additional material supporting the cylinder walls, there is no concerns with overheating or coolant flow because the area around the middle of the cylinder still maintains the same coolant area. The custom IAG closed deck inserts are machined with holes for oil and coolant to pass through the same as stock. Each IAG 800 FA20 DIT WRX Case includes machining for 1\/2\" head studs and a cylinder gasket \"o-ring\" groove to aid in head gasket sealing. If you're one of those people who prefer to do your own builds we now offer our legendary closed deck case halves for purchase separately. Simply install your crank, rods, and pistons to your own specifications and be confident that the case halves will take the power and prevent common cylinder wall failures.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-877.jpg\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eTHE IAG CLOSED DECK PROCESS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG Closed Deck conversion is performed 100% in-house by our engineers and experts using state-of-the-art equipment. The IAG Closed Deck starts with a new OEM FA20 bare case. The case is loaded and fixtured to a 4th axis rotary indexer in our Haas VF4-SS CNC Vertical Machining Center. It is supported by the main journals using a precision ground 2-inch bar and tailstock which ensures the datum is the main journals. This method gives us a true reference point to perform all machining operations. A Rennishaw probe is utilized to check that the case is fixtured true, and once confirmed the machining process begins. \u003cbr\u003e\u003cbr\u003eOnce the case is fixtured, the first step is to mill out pockets for CNC inserts. Rather than attempting to install inserts into an inconsistent cast case, the pockets are milled out to exact dimensions creating a consistent area that accepts our precision inserts. Once the pockets are machined, the case is removed from the mill and placed into a block oven at a low temperature. Our pre-machined closed-deck inserts are simultaneously chilled using dry ice. When the case and inserts have reached our desired temperature, they are moved into our install station, which holds the block and lightly presses the inserts into position on one side of the deck surface. This process is repeated on the other side and then the partially completed case is moved to a cooling rack. In the next step of our process, the case is loaded and fixtured back into the VF-4SS after reaching room temperature. During this stage, the flanges left from machining the inserts are milled close to the case deck surface. Features such as coolant passages and case bolt access positions are machined. Finally, each deck surface is machined true and flat using a Poly Crystal Diamond insert.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"AG 800 FA20DIT Closed Deck Case Inserts\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-880.jpg\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eSPECIALLY DESIGNED INSERTS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eOur machining process converts the FA20's open deck to a complete closed deck and features the use of cast insert material that closely matches the metallurgy of the aluminum case material in a factory Subaru FA engine block. By using a similar cast material (rather than billet), we ensure that during expansion and contraction the materials grow and shrink at similar rates, which is vital for maintaining roundness within the top of the bore. The inserts are machined from ¾\" cast material. Once the deck is surfaced, the result is a true ½ inch finished insert thickness.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-874.png\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eO-RING GROOVE \u0026amp; 1\/2\" HEAD STUDS FOR HEAD GASKET RELIABILITY\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eEach IAG 800 Closed Deck FA20 DIT WRX Case includes extra machining to ensure reliability of the cylinder head gaskets. During the maching processeach case gets drilled and tapped to accept 1\/2\" Head Studs (Sold Separately.) Along with the upgraded head studs, a receiver groove is machined into the surface of the deck to accept an \"o-ring\" wire. When installed, the \"o-ring\" stands slightly above the deck and provides extra tension on the head gasket to seal combustion.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Case Half Sets Bored and Honed in IAG's Sunnen SV-30\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-875.jpg\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eFINAL BORE AND HONE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eEvery IAG Closed Deck case must be bored and honed after the closed deck process. During the closed deck process the cylinder walls become slightly distorted and an overbore must be performed to the correct this distortion and prepare the block to accept new pistons. FA20 Case Halves must use 86.1mm pistons. IAG offers the Bore and Hone service with each of our closed deck case halves. When selected, the case half set is fitted with custom deck plates and bored and honed in our state-of-the-art Sunnen SV-30 Computer Controlled Cylinder Hone. \u003cstrong\u003eYOU MUST PURCHASE OR SEND IN YOUR PISTONS FOR MEASUREMENT AND SIZING IF YOU SELECT THE BORE AND HONE OPTION.\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePOWER RATING\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003ePower:The IAG 800 Closed Deck Case has a power output rating of 800 BHP\u003c\/p\u003e\u003c\/div\u003e","brand":"IAG Performance","offers":[{"title":"Yes, Bore and Hone My Block (I Will Provide Pistons)","offer_id":48059098890458,"sku":"IAG-ENG-C800BH","price":3399.99,"currency_code":"USD","in_stock":true},{"title":"No","offer_id":48059098923226,"sku":"IAG-ENG-C800","price":3099.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/IAG-ENG-C800-01__48939.1678737547.1280.1280.jpg?v=1781530159"},{"product_id":"iag-550-street-cylinder-heads-package-for-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt","title":"IAG 550 Street Cylinder Heads Package for 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT","description":"\u003ch2 style=\"text-align: center;\"\u003eIAG 550 STREET CYLINDER HEADS PACKAGE FOR 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT\u003c\/h2\u003e\n\u003chr style=\"border: none; border-top: 1px solid #e0e0e0; margin: 24px 0;\"\u003e\n\u003cdiv class=\"video-embed\" style=\"position: relative; width: 100%; padding-bottom: 56.25%; height: 0; overflow: hidden;\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/305emc5e9vQ?start=0\u0026amp;end=0\u0026amp;autoplay=1\u0026amp;loop=1\u0026amp;mute=1\u0026amp;playlist=305emc5e9vQ\u0026amp;version=3\u0026amp;rel=0\" loading=\"lazy\" style=\"position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: 0;\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003chr style=\"border: none; border-top: 1px solid #e0e0e0; margin: 24px 0;\"\u003e\n\u003cp\u003e\u003cimg alt=\"IAG 550 Subaru Cylinder Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/8d1dd02d-9ba9-40ed-8b47-1fd33d15bf7a\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display: block; margin: 0 auto;\"\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eENTRY-LEVEL STOCK REPLACEMENT HEADS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\n\u003cp\u003eThe IAG 550 Cylinder Heads are designed to function as an entry-level replacement for stock OEM heads. If your engine has suffered a catastrophic failure which requires replacement of your cylinder heads, or if you don't have OEM heads to start with, the IAG 550 Cylinder Heads are a perfect solution. These heads also work great for cars with basic bolt-on parts up to 550 BHP. These heads include upgraded GSC standard size valves, GSC Viton Valve Stem Seals, IAG Stage 1 Valve Springs with Titanium Retainers, and OEM Keepers. GSC S1 Camshafts are available with OEM valve lifter buckets. We also offer an optional chamber modification service (see below) for EJ20 heads to allow use on EJ25 short blocks.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cimg alt=\"Newen Seat and Guide Machine Machining IAG Cylinder Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/ab285357-5f46-41b2-9201-89f35697bdd1\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display: block; margin: 0 auto;\"\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eBUILT WITH 100% NEW COMPONENTS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\n\u003cp\u003eEach IAG 550 Cylinder Head Set starts with new OEM castings from Subaru of America. The first step is to select your Year and Model of vehicle so that we may provide you with the right castings to fit your project. Next, you'll select whether or not you want to include our optional GSC camshaft package. If selected, these heads will include new GSC S1 Camshafts and OEM Lifter Buckets for valve adjustment.\u003c\/p\u003e\n\u003cp\u003eThe bare castings are visually inspected and then fixtured into our in-house Centroid 5-axis CNC Machine. In the Centroid, the heads undergo a cam clearance machining process which removes material from the lifter area where larger lift and duration cam profiles are known to contact the castings. (Just in case you want to go bigger later.) Then the heads are fixtured in our Newen Valve Guide and Seat Machine to cut all intake and exhaust seats with a multi-angle valve job that suits the flow characteristics of GSC's standard size 36mm Intake and 32mm Exhaust valves. At this point, the heads' decks are resurfaced using our TS-3000 BlockMate, which cuts the aluminum to a smooth, even finish. Next, the heads are ultrasonically cleaned to remove debris and oils from the machining process. Finally, the heads are reassembled using GSC Stainless Intake and Exhaust Valves, GSC Viton stem seals, IAG-Stage 1 Valve Springs with Titanium Retainers, and OEM Valve Keepers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cimg alt=\"GSC Stage 1 Cams \u0026amp; OEM Lifter Buckets\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/5bc2130c-994d-41c5-af13-59d9e35d39f5\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display: block; margin: 0 auto;\"\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eOPTIONAL GSC S1 CAMSHAFT AND LIFTER BUCKET PACKAGE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\n\u003cp\u003eIf you're planning for more power you'll want to select these GSC Power-Division billet S1 camshafts for your IAG 550 Head Package. These will not drop any low end power, and will create more power and torque across the entire RPM range. These are perfect for stock frame upgraded turbos or up to 500 WHP upgrades. Along with the camshafts we'll include all new OEM valve lifter buckets and set bench lash using our specially designed fixture. (FINAL LASH SHOULD BE CHECKED AND ADJUSTED ONCE HEADS ARE INSTALLED)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cimg alt=\"IAG Combustion Chamber Modification for Subaru S20 Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/8be5f0bf-f7f2-4743-854c-8d27fb1032ca\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display: block; margin: 0 auto;\"\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eWHAT IS \"CHAMBER MODIFICATION\" \u0026amp; DO I NEED IT?\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\n\u003cp\u003eIAG's optional Chamber Modification Service is designed to reshape the combustion chamber of your cylinder heads to closely match the chamber of USDM STI cylinder heads to allow for use with 2.5L short blocks. This service is exclusive to USDM EJ20 2002-2005 WRX Cylinder Heads. IF YOU ARE NOT USING USDM HEADS ON A 2.5L EJ25 BLOCK, YOU DO NOT NEED THIS SERVICE.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cimg alt=\"CEI\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-378.png\" style=\"display: block; margin: 0 auto;\"\u003e\u003c\/p\u003e\n\u003ch2 style=\"text-align: center;\"\u003eQUALITY GUARANTEED\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\n\u003cp\u003eWe stand behind every hand-built engine we produce. IAG's Standard Short Block Workmanship Warranty covers your short block for 12 months or 12,000 miles. We have also teamed up with a selection of IAG Certified Installation Facilities which offer up to a 24 month\/24,000 mile workmanship warranty when the engine is purchased, installed, and tuned by that IAG Certified Installer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2 style=\"text-align: center;\"\u003ePOWER RATING\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\n\u003cp\u003ePower:The IAG 550 Cylinder Head Package has a power output rating of 550 BHP\u003c\/p\u003e\n\u003c\/div\u003e","brand":"IAG Performance","offers":[{"title":"02-05 WRX - S20 Heads (PN#IAG-ENG-H550SE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ Yes","offer_id":48059166589146,"sku":"IAG-ENG-H550SCL","price":5399.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads (PN#IAG-ENG-H550SE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059166621914,"sku":"IAG-ENG-H550SL","price":5149.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads (PN#IAG-ENG-H550SE) \/ No, I Don't Need Cams \u0026 Lifters \/ Yes","offer_id":48059166654682,"sku":"IAG-ENG-H550SCE","price":3599.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads (PN#IAG-ENG-H550SE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059166687450,"sku":"IAG-ENG-H550SE","price":3399.99,"currency_code":"USD","in_stock":true},{"title":"06-14 WRX, 06-13 FXT,  07-09 LGT - D25 Heads (PN# IAG-ENG-H550DE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059166752986,"sku":"IAG-ENG-H550DL","price":5149.99,"currency_code":"USD","in_stock":true},{"title":"06-14 WRX, 06-13 FXT,  07-09 LGT - D25 Heads (PN# IAG-ENG-H550DE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059166818522,"sku":"IAG-ENG-H550DE","price":3399.99,"currency_code":"USD","in_stock":true},{"title":"04-07 STI, 04-05 FXT, 05-09 LGT V25 Heads (PN# IAG-ENG-H550VE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059166884058,"sku":"IAG-ENG-H550VL","price":5149.99,"currency_code":"USD","in_stock":true},{"title":"04-07 STI, 04-05 FXT, 05-09 LGT V25 Heads (PN# IAG-ENG-H550VE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059166949594,"sku":"IAG-ENG-H550VE","price":3399.99,"currency_code":"USD","in_stock":true},{"title":"18-19 STI Type RA, 2019-21 STI N25 Heads (PN# IAG-ENG-H550NE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059167015130,"sku":"IAG-ENG-H550NL","price":5149.99,"currency_code":"USD","in_stock":true},{"title":"18-19 STI Type RA, 2019-21 STI N25 Heads (PN# IAG-ENG-H550NE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059167080666,"sku":"IAG-ENG-H550NE","price":3399.99,"currency_code":"USD","in_stock":true},{"title":"08-18 STI W25 Heads (PN# IAG-ENG-H550WE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059167146202,"sku":"IAG-ENG-H550WL","price":5149.99,"currency_code":"USD","in_stock":true},{"title":"08-18 STI W25 Heads (PN# IAG-ENG-H550WE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059167211738,"sku":"IAG-ENG-H550WE","price":3399.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/IAG-ENG-H550SCL-01__32651.1678380550.1280.1280.jpg?v=1781530390"},{"product_id":"iag-750-cnc-pocket-ported-competition-cylinder-heads-package-for-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt","title":"IAG 750 CNC Pocket Ported Competition Cylinder Heads Package for 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT","description":"\u003ch2 style=\"text-align:center;\"\u003eIAG 750 CNC POCKET PORTED COMPETITION CYLINDER HEADS PACKAGE FOR 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT\u003c\/h2\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cdiv class=\"video-embed\" style=\"position:relative;width:100%;padding-bottom:56.25%;height:0;overflow:hidden;\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/DZJfH2H8jns?start=0\u0026amp;end=0\u0026amp;autoplay=1\u0026amp;loop=1\u0026amp;mute=1\u0026amp;playlist=DZJfH2H8jns\u0026amp;version=3\u0026amp;rel=0\" allowfullscreen loading=\"lazy\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cimg alt=\"IAG 750 Subaru Cylinder Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/8d1dd02d-9ba9-40ed-8b47-1fd33d15bf7a\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eBUILT FOR THE WEEKEND RACER\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG 750 CNC Pocket Ported Competition Cylinder Heads are designed with the weekend racer in mind. These CNC pocket ported heads provide a significant upgrade in flow over the IAG 550 heads. These heads work great for cars with some race track duty (road, rally, auto-x, drag) and are designed to support up to 750 BHP with supporting mods. These heads include upgraded GSC Standard Size Valves, GSC Viton Valve Stem Seals, IAG Stage 1 Valve Springs with Titanium Retainers, and OEM Keepers. GSC S1 Camshafts are available with OEM valve lifter buckets. We also offer an optional chamber modification service (see below) for EJ20 heads to allow use on EJ25 short blocks.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Newen Seat and Guide Machine Machining IAG 750 Cylinder Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/ab285357-5f46-41b2-9201-89f35697bdd1\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eBUILT WITH 100% NEW COMPONENTS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\n\u003cp\u003eEach IAG 750 Cylinder Head Set starts with new OEM castings from Subaru of America. The first step is to select your Year and Model of vehicle so that we may provide you with the right castings to fit your project. Next, you'll select whether or not you want to include our optional GSC camshaft package. If selected, these heads will include new GSC S1 Camshafts and OEM Lifter Buckets for valve adjustment.\u003c\/p\u003e \u003cp\u003e The bare castings are visually inspected and then fixtured into our in-house Centroid 5-axis CNC Machine. The Centroid CNC ports the intake and exhaust runners under the valves and blends them to the valve seat. Once the Centroid completes the port process, the heads undergo a cam clearance machining process which removes material from the lifter area where larger lift and duration cam profiles are known to contact the castings. The heads are then fixtured in our Newen Valve Guide and Seat Machine to cut all intake and exhaust seats with a multi-angle valve job that suits the flow characteristics of GSC's standard size valves. At this point, the heads' decks are resurfaced using our TS-3000 BlockMate, which cuts the aluminum to a smooth, even finish. Next, the heads are ultrasonically cleaned to remove debris and oils from the machining process. Finally, the heads are reassembled using IAG Stage 1 Single Valve Springs and Titanium Retainers along with GSC Viton stem seals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg alt=\"IAG 750 CNC Pocket Port Cylinder Head\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/c75893c5-fbe3-4fa8-9257-bd624d4640ba\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eWHAT IS A POCKET PORT?\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003ePocket porting is enlarging and blending the area under the valve seat. This is one of the most critical areas to get right in any porting job. Luckily, our Centroid 5 axis cylinder head porting machine gets it perfect every time. The area about 1\" under the valve is enlarged and blended to ensure a smooth transition and increase power. The rest of the port is left alone because additional volume is not required at these power levels, and can even hurt velocity if there's not enough airflow.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Stage 1 GSC Cams \" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/d47baaf4-15c4-42b1-ac59-7da99df8ca28\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eOPTIONAL GSC S1 CAMSHAFT AND LIFTER BUCKET PACKAGE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eIf you're planning for more power you'll want to select these GSC Power-Division billet S1 camshafts for your IAG 750 Head Package. These will not drop any low end power, and will create more power and torque across the entire RPM range. These are perfect for stock frame upgraded turbos or up to higher horsepower upgrades. Along with the camshafts we'll include all new OEM valve lifter buckets and set bench lash using our specially designed fixture. (FINAL LASH SHOULD BE CHECKED AND ADJUSTED ONCE HEADS ARE INSTALLED)\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"IAG Combustion Chamber Modification Before \u0026amp; After\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/d1577d46-1601-4d1b-b210-f6c3eff38ab7\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eWHAT IS \"CHAMBER MODIFICATION\" \u0026amp; DO I NEED IT?\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eIAG's optional Chamber Modification Service is designed to reshape the combustion chamber of your cylinder heads to closely match the chamber of USDM STI cylinder heads to allow for use with 2.5L short blocks. This service is exclusive to USDM EJ20 2002-2005 WRX Cylinder Heads. IF YOU ARE NOT USING USDM HEADS ON A 2.5L EJ25 BLOCK, YOU DO NOT NEED THIS SERVICE.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"CEI\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-378.png\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eQUALITY GUARANTEED\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eWe stand behind every hand-built engine we produce. IAG's Standard Short Block Workmanship Warranty covers your short block for 12 months or 12,000 miles. We have also teamed up with a selection of IAG Certified Installation Facilities which offer up to a 24 month\/24,000 mile workmanship warranty when the engine is purchased, installed, and tuned by that IAG Certified Installer.\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePOWER RATING\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003ePower:The IAG 750 Cylinder Head Package has a power output rating of 750 BHP\u003c\/p\u003e\u003c\/div\u003e","brand":"IAG Performance","offers":[{"title":"02-05 WRX - S20 Heads(PN#IAG-ENG-H750SE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ Yes","offer_id":48059167539418,"sku":"IAG-ENG-H750SCL","price":6399.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads(PN#IAG-ENG-H750SE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059167572186,"sku":"IAG-ENG-H750SL","price":6199.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads(PN#IAG-ENG-H750SE) \/ No, I Don't Need Cams \u0026 Lifters \/ Yes","offer_id":48059167604954,"sku":"IAG-ENG-H750SCE","price":4399.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads(PN#IAG-ENG-H750SE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059167637722,"sku":"IAG-ENG-H750SE","price":4249.99,"currency_code":"USD","in_stock":true},{"title":"06-14 WRX, 06-13 FXT,  07-09 LGT - D25 Heads (PN# IAG-ENG-H750DE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059167703258,"sku":"IAG-ENG-H750DL","price":6199.99,"currency_code":"USD","in_stock":true},{"title":"06-14 WRX, 06-13 FXT,  07-09 LGT - D25 Heads (PN# IAG-ENG-H750DE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059167768794,"sku":"IAG-ENG-H750DE","price":4249.99,"currency_code":"USD","in_stock":true},{"title":"04-07 STI, 04-05 FXT, 05-06 LGT - V25 Heads (PN# IAG-ENG-H750VE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059167834330,"sku":"IAG-ENG-H750VL","price":6199.99,"currency_code":"USD","in_stock":true},{"title":"04-07 STI, 04-05 FXT, 05-06 LGT - V25 Heads (PN# IAG-ENG-H750VE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059167899866,"sku":"IAG-ENG-H750VE","price":4249.99,"currency_code":"USD","in_stock":true},{"title":"18-19 STI Type RA, 2019-21 STI - N25 Heads (PN# IAG-ENG-H750NE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059167965402,"sku":"IAG-ENG-H750NL","price":6199.99,"currency_code":"USD","in_stock":true},{"title":"18-19 STI Type RA, 2019-21 STI - N25 Heads (PN# IAG-ENG-H750NE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059168030938,"sku":"IAG-ENG-H750NE","price":4249.99,"currency_code":"USD","in_stock":true},{"title":"08-18 STI - W25 Heads (PN# IAG-ENG-H750WE) \/ Yes, Include GSC S1 Camshafts \u0026 Lifters \/ No","offer_id":48059168096474,"sku":"IAG-ENG-H750WL","price":6199.99,"currency_code":"USD","in_stock":true},{"title":"08-18 STI - W25 Heads (PN# IAG-ENG-H750WE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059168162010,"sku":"IAG-ENG-H750WE","price":4249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/IAG-ENG-H750SCL-01__72754.1678396249.1280.1280.jpg?v=1781530386"},{"product_id":"iag-1150-cnc-ported-drag-cylinder-heads-package-for-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt","title":"IAG 1150 CNC Ported Drag Cylinder Heads Package for 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT","description":"\u003ch2 style=\"text-align:center;\"\u003eIAG 1150 CNC PORTED DRAG CYLINDER HEADS PACKAGE FOR 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT\u003c\/h2\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cdiv class=\"video-embed\" style=\"position:relative;width:100%;padding-bottom:56.25%;height:0;overflow:hidden;\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/tzKnCsSDhTk?start=0\u0026amp;end=0\u0026amp;autoplay=1\u0026amp;loop=1\u0026amp;mute=1\u0026amp;playlist=tzKnCsSDhTk\u0026amp;version=3\u0026amp;rel=0\" allowfullscreen loading=\"lazy\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cimg alt=\"IAG 750 Subaru Cylinder Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/8d1dd02d-9ba9-40ed-8b47-1fd33d15bf7a\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eMAXIMUM POWER FOR DRAG RACING\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG 1150 CNC Ported Drag Cylinder Heads are designed for drag racing and competition. These fully CNC ported heads provide a significant upgrade in long term performance over the IAG 950 heads. These heads work great for cars where getting the most power with maximum reliability is the goal. The IAG 1150 heads are the best heads available for high-horsepower drag racing. They are designed to support up to 1150 BHP with supporting mods. These heads include upgraded Ferrea Valves, GSC Viton Valve Stem Seals, Upgraded GSC Valve Guides, Ferrea Dual Drag Valve Springs with Titanium Retainers, and Ferrea Keepers. GSC S2 or S3 Camshafts are available with Kelford DLC Coated valve lifter buckets. We also offer an optional chamber modification service (see below) for EJ20 heads to allow use on EJ25 short blocks.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Newen Seat and Guide Machine Machining IAG 750 Cylinder Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/ab285357-5f46-41b2-9201-89f35697bdd1\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eBUILT WITH 100% NEW COMPONENTS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\n\u003cp\u003eEach IAG 1150 Cylinder Head Set starts with new OEM castings from Subaru of America. The first step is to select your Year and Model of vehicle so that we may provide you with the right castings to fit your project. Next, you'll select whether or not you want to include our optional GSC camshaft package. If selected, these heads will include new GSC S2 or S3 Camshafts and Kelford DLC Coated Lifter Buckets for valve adjustment.\u003c\/p\u003e \u003cp\u003eThis IAG 1150 fully CNC ported head package starts with brand new WRX STI OEM head castings directly from Subaru of America. The bare castings are visually inspected then fixtured into our in-house Centroid 5-axis CNC Machine. The Centroid CNC ports the intake and hard to reach exhaust \"dog-leg\" port runner. The benefit of CNC porting is not only an efficient way of machining the heads it also offers consistent port results that are hard to achieve by hand. Once the Centroid completes the port process the heads undergo a cam clearance machining process that removes material from the lifter area where large duration cam profiles are known to contact the castings. Shortly after the heads are drilled to fit larger 1\/2\" or 14mm head studs, which are commonly used in high horsepower builds. Next, the OEM guides are pressed out and replaced in favor of GSC Manganese-Bronze valve guides that are shaped to improve airflow. Once all the new intake and exhaust guides are in place they are diamond-honed in our honing station. The heads are then fixtured in our Newen Valve Guide and Seat Machine to cut all intake and exhaust seats with a multi-angle valve job that suits the flow characteristics of Ferrea's +1mm valves. At this point, the heads' decks are resurfaced using our TS-3000 BlockMate which cuts the aluminum to a smooth even finish. Next, the heads are ultrasonically cleaned to remove debris and oils from the machining process. Finally, the heads are reassembled using Ferrea Drag Springs and Retainers along with Ferrea Viton stem seals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg alt=\"Cylinder Head Porting\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/5b368803-7ea7-4308-9364-8473a85efaee\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eWHAT MAKES CNC PORTING BETTER?\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eCylinder head porting has been around since the invention of the internal combustion engine. It can be done by hand with a die grinder and some cartridge rolls, and a seasoned professional can likely get a good result that way. Unfortunately, doing porting this way requires a lot of experience and care. One slip of the die grinder can ruin your cylinder head. This is where CNC porting comes in. Using our Centroid 5 axis CNC porting machine we can achieve the same results every time we put a set of heads into the machine. Every cylinder head comes out exactly the same and uses our race-proven, computer controlled, CNC porting program to guarantee results.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"GSC Cams for IAG 1150 CNC Ported Drag Cylinder Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/975c3598-8641-4beb-a657-bcbbe0b788cc\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eOPTIONAL GSC S2 OR S3 CAMSHAFT AND LIFTER BUCKET PACKAGE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\n\u003cp\u003eTo get the most out of these heads you'll want to select the GSC Power-Division billet S2 camshafts for your IAG 1150 Head Package. These cams are built to suit the higher horsepower these heads will support. With a power range of 500 WHP and up, you need some additional supporting mods to utilize the true potential of the S2s. Our IAG 1150 Short Block, an upgraded turbocharger and fuel system, and a quality engine management system are key.\u003c\/p\u003e \u003cp\u003e If you're targeting maximum power over 1000 whp and willing to give up some low end drivability, the GSC S3 cams are the way to go. Along with the camshafts we'll include all new Kelford DLC Coated valve lifter buckets and set bench lash using our specially designed fixture. (FINAL LASH SHOULD BE CHECKED AND ADJUSTED ONCE HEADS ARE INSTALLED)\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg alt=\"IAG Cylinder Head Combustion Chamber Modification for S20 Subaru Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/31e9a5ff-d79c-416c-9e5e-690ed83c6c71\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eWHAT IS \"CHAMBER MODIFICATION\" \u0026amp; DO I NEED IT?\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eIAG's optional Chamber Modification Service is designed to reshape the combustion chamber of your cylinder heads to closely match the chamber of USDM STI cylinder heads to allow for use with 2.5L short blocks. This service is exclusive to USDM EJ20 2002-2005 WRX Cylinder Heads. IF YOU ARE NOT USING USDM HEADS ON A 2.5L EJ25 BLOCK, YOU DO NOT NEED THIS SERVICE.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"CEI\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-378.png\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eQUALITY GUARANTEED\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eWe stand behind every hand-built engine we produce. IAG's Standard Short Block Workmanship Warranty covers your short block for 12 months or 12,000 miles. We have also teamed up with a selection of IAG Certified Installation Facilities which offer up to a 24 month\/24,000 mile workmanship warranty when the engine is purchased, installed, and tuned by that IAG Certified Installer.\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePOWER RATING\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003ePower:The IAG 1150 Cylinder Head Package has a power output rating of 1150 BHP\u003c\/p\u003e\u003c\/div\u003e","brand":"IAG Performance","offers":[{"title":"02-05 WRX - S20 Heads (PN#IAG-ENG-H115SE) \/ Yes, Include GSC S2 Camshafts \u0026 Lifters \/ Yes","offer_id":48059168194778,"sku":"IAG-ENG-H115SCL2","price":8249.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads (PN#IAG-ENG-H115SE) \/ Yes, Include GSC S2 Camshafts \u0026 Lifters \/ No","offer_id":48059168227546,"sku":"IAG-ENG-H115SL2","price":7999.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads (PN#IAG-ENG-H115SE) \/ No, I Don't Need Cams \u0026 Lifters \/ Yes","offer_id":48059168260314,"sku":"IAG-ENG-H115SCE","price":6499.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads (PN#IAG-ENG-H115SE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059168293082,"sku":"IAG-ENG-H115SE","price":6299.99,"currency_code":"USD","in_stock":true},{"title":"06-14 WRX, 06-13 FXT,  07-09 LGT - D25 Heads (PN# IAG-ENG-H115DE) \/ Yes, Include GSC S2 Camshafts \u0026 Lifters \/ No","offer_id":48059168358618,"sku":"IAG-ENG-H115DL2","price":7999.99,"currency_code":"USD","in_stock":true},{"title":"06-14 WRX, 06-13 FXT,  07-09 LGT - D25 Heads (PN# IAG-ENG-H115DE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059168424154,"sku":"IAG-ENG-H115DE","price":6299.99,"currency_code":"USD","in_stock":true},{"title":"04-07 STI, 04-05 FXT, 05-06 LGT - V25 Heads (PN# IAG-ENG-H115VE) \/ Yes, Include GSC S2 Camshafts \u0026 Lifters \/ No","offer_id":48059168489690,"sku":"IAG-ENG-H115VL2","price":7999.99,"currency_code":"USD","in_stock":true},{"title":"04-07 STI, 04-05 FXT, 05-06 LGT - V25 Heads (PN# IAG-ENG-H115VE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059168555226,"sku":"IAG-ENG-H115VE","price":6299.99,"currency_code":"USD","in_stock":true},{"title":"18-19 STI Type RA, 2019-21 STI - N25 Heads (PN# IAG-ENG-H115NE) \/ Yes, Include GSC S2 Camshafts \u0026 Lifters \/ No","offer_id":48059168620762,"sku":"IAG-ENG-H115NL2","price":7999.99,"currency_code":"USD","in_stock":true},{"title":"18-19 STI Type RA, 2019-21 STI - N25 Heads (PN# IAG-ENG-H115NE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059168686298,"sku":"IAG-ENG-H115NE","price":6299.99,"currency_code":"USD","in_stock":true},{"title":"08-18 STI - W25 Heads (PN# IAG-ENG-H115WE) \/ Yes, Include GSC S2 Camshafts \u0026 Lifters \/ No","offer_id":48059168751834,"sku":"IAG-ENG-H115WL2","price":7999.99,"currency_code":"USD","in_stock":true},{"title":"08-18 STI - W25 Heads (PN# IAG-ENG-H115WE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059168817370,"sku":"IAG-ENG-H115WE","price":6299.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads (PN#IAG-ENG-H115SE) \/ Yes, Upgrade to GSC S3 Camshafts (REQUIRES Standalone Engine Management, May Not Be Compatible with AVCS) \/ Yes","offer_id":48059168850138,"sku":"IAG-ENG-H115SCL3","price":8249.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads (PN#IAG-ENG-H115SE) \/ Yes, Upgrade to GSC S3 Camshafts (REQUIRES Standalone Engine Management, May Not Be Compatible with AVCS) \/ No","offer_id":48059168882906,"sku":"IAG-ENG-H115SL3","price":7999.99,"currency_code":"USD","in_stock":true},{"title":"06-14 WRX, 06-13 FXT,  07-09 LGT - D25 Heads (PN# IAG-ENG-H115DE) \/ Yes, Upgrade to GSC S3 Camshafts (REQUIRES Standalone Engine Management, May Not Be Compatible with AVCS) \/ No","offer_id":48059168948442,"sku":"IAG-ENG-H115DL3","price":7999.99,"currency_code":"USD","in_stock":true},{"title":"04-07 STI, 04-05 FXT, 05-06 LGT - V25 Heads (PN# IAG-ENG-H115VE) \/ Yes, Upgrade to GSC S3 Camshafts (REQUIRES Standalone Engine Management, May Not Be Compatible with AVCS) \/ No","offer_id":48059169013978,"sku":"IAG-ENG-H115VL3","price":7999.99,"currency_code":"USD","in_stock":true},{"title":"18-19 STI Type RA, 2019-21 STI - N25 Heads (PN# IAG-ENG-H115NE) \/ Yes, Upgrade to GSC S3 Camshafts (REQUIRES Standalone Engine Management, May Not Be Compatible with AVCS) \/ No","offer_id":48059169079514,"sku":"IAG-ENG-H115NL3","price":7999.99,"currency_code":"USD","in_stock":true},{"title":"08-18 STI - W25 Heads (PN# IAG-ENG-H115WE) \/ Yes, Upgrade to GSC S3 Camshafts (REQUIRES Standalone Engine Management, May Not Be Compatible with AVCS) \/ No","offer_id":48059169145050,"sku":"IAG-ENG-H115WL3","price":7999.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/IAG-ENG-H115-OPT-01__81039.1678402161.1280.1280.jpg?v=1781530403"},{"product_id":"iag-600-street-cylinder-heads-package-for-2015-21-wrx","title":"IAG 600 Street Cylinder Heads Package for 2015-21 WRX","description":"\u003ch2 style=\"text-align:center;\"\u003eIAG 600 STREET CYLINDER HEADS PACKAGE FOR 2015-2021 SUBARU WRX\u003c\/h2\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cimg alt=\"IAG 600 Street Cylinder Heads for FA20 DIT 2015-2021 Subaru WRX\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/b85dfe31-8aa4-422c-81d1-f4848f4ac7d9\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eENTRY-LEVEL STOCK REPLACEMENT HEADS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG 600 Cylinder Heads are designed to function as an entry-level replacement for stock OEM 2015-2021 Subaru WRX heads. If your engine has suffered a catastrophic failure which requires replacement of your cylinder heads, or if you don't have OEM heads to start with, the IAG 600 Cylinder Heads are a perfect solution. These heads also work great for cars with basic bolt-on parts up to 600 BHP. These heads include upgraded GSC standard size valves, GSC Viton Valve Stem Seals, Kelford Valve Springs with Titanium Retainers, and OEM Keepers. FA20 Heads are configured differently from their EJ counterparts. In FA20 heads the casting is split into two parts, the \"lower\" and the \"cam towers.\" As the name suggests, the \"Cam Towers\" hold the camshafts to the cylinder head. Kelford EZ cams are available with IAG 600 Street Cylinder Heads. When Kelford cams are chosen we also include new OEM cam towers, rockers, pivots, and valve shim caps.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Newen Seat and Guide Machine Machining IAG Cylinder Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/ab285357-5f46-41b2-9201-89f35697bdd1\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eBUILT WITH 100% NEW COMPONENTS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\n\u003cp\u003eEach IAG 600 FA20 DIT Cylinder Head Set starts with new OEM castings from Subaru of America. Next, you'll select whether or not you want to include our optional Kelford camshaft package. If selected, these heads will include Kelford EZ camshafts as well as new OEM cam towers, rockers, pivots, and valve shim caps.\u003c\/p\u003e \u003cp\u003eThe new castings are visually inspected and disassembled. Then the heads are fixtured in our Newen Valve Guide and Seat Machine to cut all intake and exhaust seats with a multi-angle valve job that suits the flow characteristics of GSC's standard size 34mm Intake and 29mm Exhaust valves. At this point, the heads' decks are resurfaced using our TS-3000 BlockMate, which cuts the aluminum to a smooth, even finish. Next, the heads are ultrasonically cleaned to remove debris and oils from the machining process. Finally, the heads are reassembled using GSC Stainless Intake and Exhaust Valves, GSC Viton stem seals, Kelford Dual Valve Springs with Titanium Retainers, and OEM Valve Keepers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg alt=\"IAG 600 Street Cylinder Heads for FA20 DIT 2015-2021 Subaru WRX Kelford Camshaft Package\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/8b6fc76f-bfd9-4c04-8b2f-1f00b334a057\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eOPTIONAL KELFORD \"EZ\" CAMSHAFT AND LIFTER PACKAGE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eIf you're planning for more power you'll want to select these Kelford EZ camshafts for your IAG 600 Head Package. These will not drop any low end power, and will create more power and torque across the entire RPM range. These are perfect for stock frame upgraded turbos or up to 500 WHP upgrades. Along with the camshafts we'll include all new OEM cam towers, rockers, pivots, and valve shim caps. Finally, We'll take care of setting bench lash using our specially designed fixture. (FINAL LASH SHOULD BE CHECKED AND ADJUSTED ONCE HEADS ARE INSTALLED)\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"CEI\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-378.png\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eQUALITY GUARANTEED\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eWe stand behind every hand-built engine we produce. IAG's Standard Short Block Workmanship Warranty covers your short block for 12 months or 12,000 miles. We have also teamed up with a selection of IAG Certified Installation Facilities which offer up to a 24 month\/24,000 mile workmanship warranty when the engine is purchased, installed, and tuned by that IAG Certified Installer.\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePOWER RATING\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003ePower:The IAG 600 Cylinder Head Package has a power output rating of 600 BHP\u003c\/p\u003e\u003c\/div\u003e","brand":"IAG Performance","offers":[{"title":"Yes, Include Kelford EZ Cams, Cam Towers, Lifters \u0026 Rockers","offer_id":48059169177818,"sku":"IAG-ENG-H600L","price":5999.99,"currency_code":"USD","in_stock":true},{"title":"No, I Only Want The Assembled Lower Portion of The Heads","offer_id":48059169210586,"sku":"IAG-ENG-H600E","price":3199.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/IAG-ENG-H600-OPT-01__89472.1678468383.1280.1280.jpg?v=1781530352"},{"product_id":"iag-950-cnc-ported-race-cylinder-heads-package-for-02-14-wrx-04-21-sti-05-09-lgt-04-13-fxt","title":"IAG 950 CNC Ported Race Cylinder Heads Package for 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT","description":"\u003ch2 style=\"text-align:center;\"\u003eIAG 950 CNC PORTED RACE CYLINDER HEADS PACKAGE FOR 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT\u003c\/h2\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cdiv class=\"video-embed\" style=\"position:relative;width:100%;padding-bottom:56.25%;height:0;overflow:hidden;\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/zl-fz5KimVA?start=0\u0026amp;end=0\u0026amp;autoplay=1\u0026amp;loop=1\u0026amp;mute=1\u0026amp;playlist=zl-fz5KimVA\u0026amp;version=3\u0026amp;rel=0\" allowfullscreen loading=\"lazy\" style=\"position:absolute;top:0;left:0;width:100%;height:100%;border:0;\"\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cimg alt=\"IAG 950 Subaru Cylinder Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/8d1dd02d-9ba9-40ed-8b47-1fd33d15bf7a\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eBUILT WITH RACING IN MIND\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG 950 CNC Ported Race Cylinder Heads are designed for racing and competition. These fully CNC ported heads provide a significant upgrade in flow over the IAG 750 heads. These heads work great for cars where getting more power might be the difference between winning or losing that big race. The IAG 950 heads work great for drag racing, as well as high horsepower time attack or hill climb, and are designed to support up to 950 BHP with supporting mods. These heads include upgraded GSC +1MM Superalloy Valves, GSC Viton Valve Stem Seals, Upgraded GSC Valve Guides, IAG-Spec Beehive Valve Springs with Titanium Retainers, and OEM Keepers. GSC S2 Camshafts are available with Kelford DLC Coated valve lifter buckets. We also offer an optional chamber modification service (see below) for EJ20 heads to allow use on EJ25 short blocks.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Newen Seat and Guide Machine Machining IAG 950 Cylinder Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/ab285357-5f46-41b2-9201-89f35697bdd1\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eBUILT WITH 100% NEW COMPONENTS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\n\u003cp\u003eEach IAG 950 Cylinder Head Set starts with new OEM castings from Subaru of America. The first step is to select your Year and Model of vehicle so that we may provide you with the right castings to fit your project. Next, you'll select whether or not you want to include our optional GSC camshaft package. If selected, these heads will include new GSC S2 Camshafts and Kelford DLC Coated Lifter Buckets for valve adjustment.\u003c\/p\u003e \u003cp\u003eThis IAG 950 fully CNC ported head package starts with brand new WRX STI OEM head castings directly from Subaru of America. The bare castings are visually inspected then fixtured into our in-house Centroid 5-axis CNC Machine. The Centroid CNC ports the intake and hard to reach exhaust \"dog-leg\" port runner. The benefit of CNC porting is not only an efficient way of machining the heads it also offers consistent port results that are hard to achieve by hand. Once the Centroid completes the port process the heads undergo a cam clearance machining process that removes material from the lifter area where large duration cam profiles are known to contact the castings. Shortly after the heads are drilled to fit larger 1\/2\" or 14mm head studs, which are commonly used in high horsepower builds. Next, the OEM guides are pressed out and replaced in favor of GSC Manganese-Bronze valve guides that are shaped to improve airflow. Once all the new intake and exhaust guides are in place they are diamond-honed in our honing station. The heads are then fixtured in our Newen Valve Guide and Seat Machine to cut all intake and exhaust seats with a multi-angle valve job that suits the flow characteristics of GSC's +1mm valves. At this point, the heads' decks are resurfaced using our TS-3000 BlockMate which cuts the aluminum to a smooth even finish. Next, the heads are ultrasonically cleaned to remove debris and oils from the machining process. Finally, the heads are reassembled using IAG-Spec Beehive Valve Springs and Retainers along with GSC Viton stem seals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg alt=\"IAG CNC Port CAD Model for EJ Subaru Engines\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/5b368803-7ea7-4308-9364-8473a85efaee\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eWHAT MAKES CNC PORTING BETTER?\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eCylinder head porting has been around since the invention of the internal combustion engine. It can be done by hand with a die grinder and some cartridge rolls, and a seasoned professional can likely get a good result that way. Unfortunately, doing porting this way requires a lot of experience and care. One slip of the die grinder can ruin your cylinder head. This is where CNC porting comes in. Using our Centroid 5 axis CNC porting machine we can achieve the same results every time we put a set of heads into the machine. Every cylinder head comes out exactly the same and uses our race-proven, computer controlled, CNC porting program to guarantee results.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"GSC Stage 2 Cams\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/8d1022b0-a632-4e72-9c31-e1137eb88bd2\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eOPTIONAL GSC S2 CAMSHAFT AND LIFTER BUCKET PACKAGE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eTo get the most out of these heads you'll want to select the GSC Power-Division billet S2 camshafts for your IAG 950 Head Package. These cams are built to suit the higher horsepower these heads will support. With a power range of 500 WHP and up, you need some additional supporting mods to utilize the true potential of the S2s. Our IAG 950 Short Block, an upgraded turbocharger and fuel system, and a quality engine management system are key. Along with the camshafts we'll include all new Kelford DLC Coated valve lifter buckets and set bench lash using our specially designed fixture. (FINAL LASH SHOULD BE CHECKED AND ADJUSTED ONCE HEADS ARE INSTALLED)\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Combustion Chamber Modification Before and After\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/921acca8-bf18-42df-b2fb-55877920f33c\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eWHAT IS \"CHAMBER MODIFICATION\" \u0026amp; DO I NEED IT?\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eIAG's optional Chamber Modification Service is designed to reshape the combustion chamber of your cylinder heads to closely match the chamber of USDM STI cylinder heads to allow for use with 2.5L short blocks. This service is exclusive to USDM EJ20 2002-2005 WRX Cylinder Heads. IF YOU ARE NOT USING USDM HEADS ON A 2.5L EJ25 BLOCK, YOU DO NOT NEED THIS SERVICE.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"CEI\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-378.png\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eQUALITY GUARANTEED\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eWe stand behind every hand-built engine we produce. IAG's Standard Short Block Workmanship Warranty covers your short block for 12 months or 12,000 miles. We have also teamed up with a selection of IAG Certified Installation Facilities which offer up to a 24 month\/24,000 mile workmanship warranty when the engine is purchased, installed, and tuned by that IAG Certified Installer.\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePOWER RATING\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003ePower:The IAG 950 Cylinder Head Package has a power output rating of 950 BHP\u003c\/p\u003e\u003c\/div\u003e","brand":"IAG Performance","offers":[{"title":"02-05 WRX - S20 Heads(PN#IAG-ENG-H950SE) \/ Yes, Include GSC S2 Cams \u0026 Kelford DLC Coated Lifters \/ Yes","offer_id":48059169243354,"sku":"IAG-ENG-H950SCL","price":6999.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads(PN#IAG-ENG-H950SE) \/ Yes, Include GSC S2 Cams \u0026 Kelford DLC Coated Lifters \/ No","offer_id":48059169276122,"sku":"IAG-ENG-H950SL","price":6799.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads(PN#IAG-ENG-H950SE) \/ No, I Don't Need Cams \u0026 Lifters \/ Yes","offer_id":48059169308890,"sku":"IAG-ENG-H950SCE","price":5249.99,"currency_code":"USD","in_stock":true},{"title":"02-05 WRX - S20 Heads(PN#IAG-ENG-H950SE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059169341658,"sku":"IAG-ENG-H950SE","price":4999.99,"currency_code":"USD","in_stock":true},{"title":"06-14 WRX, 06-13 FXT,  07-09 LGT - D25 Heads (PN# IAG-ENG-H950DE) \/ Yes, Include GSC S2 Cams \u0026 Kelford DLC Coated Lifters \/ No","offer_id":48059169407194,"sku":"IAG-ENG-H950DL","price":6799.99,"currency_code":"USD","in_stock":true},{"title":"06-14 WRX, 06-13 FXT,  07-09 LGT - D25 Heads (PN# IAG-ENG-H950DE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059169472730,"sku":"IAG-ENG-H950DE","price":4999.99,"currency_code":"USD","in_stock":true},{"title":"04-07 STI, 04-05 FXT, 05-06 LGT - V25 Heads (PN# IAG-ENG-H950VE) \/ Yes, Include GSC S2 Cams \u0026 Kelford DLC Coated Lifters \/ No","offer_id":48059169538266,"sku":"IAG-ENG-H950VL","price":6799.99,"currency_code":"USD","in_stock":true},{"title":"04-07 STI, 04-05 FXT, 05-06 LGT - V25 Heads (PN# IAG-ENG-H950VE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059169603802,"sku":"IAG-ENG-H950VE","price":4999.99,"currency_code":"USD","in_stock":true},{"title":"18-19 STI Type RA, 2019+ STI - N25 Heads (PN# IAG-ENG-H950NE) \/ Yes, Include GSC S2 Cams \u0026 Kelford DLC Coated Lifters \/ No","offer_id":48059169669338,"sku":"IAG-ENG-H950NL","price":6799.99,"currency_code":"USD","in_stock":true},{"title":"18-19 STI Type RA, 2019+ STI - N25 Heads (PN# IAG-ENG-H950NE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059169734874,"sku":"IAG-ENG-H950NE","price":4999.99,"currency_code":"USD","in_stock":true},{"title":"08-18 STI - W25 Heads (PN# IAG-ENG-H950WE) \/ Yes, Include GSC S2 Cams \u0026 Kelford DLC Coated Lifters \/ No","offer_id":48059169800410,"sku":"IAG-ENG-H950WL","price":6799.99,"currency_code":"USD","in_stock":true},{"title":"08-18 STI - W25 Heads (PN# IAG-ENG-H950WE) \/ No, I Don't Need Cams \u0026 Lifters \/ No","offer_id":48059169865946,"sku":"IAG-ENG-H950WE","price":4999.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/IAG-ENG-H950-OPT-01__34169.1678398068.1280.1280.jpg?v=1781530386"},{"product_id":"iag-800-cnc-pocket-ported-competition-cylinder-heads-package-for-2015-21-wrx","title":"IAG 800 CNC Pocket Ported Competition Cylinder Heads Package for 2015-21 WRX","description":"\u003ch2 style=\"text-align:center;\"\u003eIAG 800 POCKET PORTED COMPETITION CYLINDER HEADS PACKAGE FOR 2015-2021 SUBARU WRX\u003c\/h2\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cimg alt=\"IAG 800 CNC Pocket Ported Competition Cylinder Head Package\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/b85dfe31-8aa4-422c-81d1-f4848f4ac7d9\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eDESIGNED WITH THE WEEKEND RACER IN MIND\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG 800 CNC Pocket Ported Competition Cylinder Heads are designed with the weekend racer in mind. These CNC pocket ported heads provide a significant upgrade in flow over the IAG 600 heads. These heads work great for cars with some race track duty (road, rally, auto-x, drag) and are designed to support up to 800 BHP with supporting mods. These heads include upgraded GSC +1mm Stainless Steel Valves, GSC Viton Valve Stem Seals, Upgraded GSC Valve Guides, Kelford Dual Valve Springs with Titanium Retainers, and OEM Keepers. FA20 Heads are configured differently from their EJ counterparts. In FA20 heads the casting is split into two parts, the \"lower\" and the \"cam towers.\" As the name suggests, the \"Cam Towers\" hold the camshafts to the cylinder head. Kelford \"A\" cams are available with IAG 800 Cylinder Heads. When Kelford cams are chosen we also include new OEM cam towers, rockers, pivots, and valve shim caps.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Newen Seat and Guide Machine Machining IAG Cylinder Heads\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/ab285357-5f46-41b2-9201-89f35697bdd1\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eBUILT WITH 100% NEW COMPONENTS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\n\u003cp\u003eEach IAG 800 FA20 DIT Cylinder Head Set starts with new OEM castings from Subaru of America. Next, you'll select whether or not you want to include our optional Kelford camshaft package. If selected, these heads will include Kelford \"A\" camshafts as well as new OEM cam towers, rockers, pivots, and valve shim caps.\u003c\/p\u003e \u003cp\u003eThe bare castings are visually inspected and the OEM guides are pressed out. The heads are then fixtured into our in-house Centroid 5-axis CNC Machine, one of the most advanced precision engine machining equipment in the world. The Centroid CNC performs a \"pocket port\" of the area under the valves, enlarging and blending the opening under the valves. The benefit of CNC porting is not only an efficient way of machining the heads it also offers consistent port results that are hard to achieve by hand. Once the Centroid completes the porting process the heads are drilled to fit larger 1\/2\" or 14mm head studs which are commonly used in high horsepower builds. Next, the OEM press-fit freeze plugs are removed, to avoid a common known failure in which they loosen and leak coolant into the engine oil as well as externally. To eliminate this problem each head is tapped and threaded plugs are installed. At this point, GSC Manganese-Bronze valve guides that are shaped to improve airflow are pressed into place then all the new intake and exhaust guides are diamond-honed in our honing station. The heads are then fixtured in our Newen Valve Guide and Seat Machine to cut all intake and exhaust seats with a multi-angle valve job that suits the flow characteristics of GSC's +1mm valves. The heads decks are then resurfaced using our TS-3000 BlockMate that cuts the aluminum to a smooth even finish. To remove debris and oils from the machining process, the heads are ultrasonically cleaned. Finally, the heads are reassembled using Kelford Dual Cylindrical Valve Springs and Retainers along with GSC Viton stem seals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cimg alt=\"IAG 800 CNC Pocket Ported Competition Cylinder Head Package Valve Opening\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/bce7f155-82a7-4072-a6bf-c6782a2bdb05\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eWHAT IS A POCKET PORT?\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003ePocket porting is enlarging and blending the area under the valve seat. This is one of the most critical areas to get right in any porting job. Luckily, our Centroid 5 axis cylinder head porting machine gets it perfect every time. The area about 1\" under the valve is enlarged and blended to ensure a smooth transition and increase power. The rest of the port is left alone because additional volume is not required at these power levels, and can even hurt velocity if there's not enough airflow.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/b449834e-f6f4-469f-b25b-b9d83c2ca221\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eOPTIONAL KELFORD \"A\" CAMSHAFT AND LIFTER PACKAGE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eIf you're planning for more power you'll want to select these Kelford \"A\" camshafts for your IAG 800 Head Package. These cams are perfect for those seeking more power for their modified FA20 WRX. These cams will support up to 800 BHP. Along with the camshafts we'll include all new OEM cam towers, rockers, pivots, and valve shim caps. Finally, we'll take care of setting bench lash using our specially designed fixture. (FINAL LASH SHOULD BE CHECKED AND ADJUSTED ONCE HEADS ARE INSTALLED)\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"IAG FA20 Freeze Plug Modification Service\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/806cbdc7-aa37-4931-aaae-335c7a9d9562\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eKEEP COOLANT OUT OF YOUR OIL WITH IAG'S FA20 CASTING PLUG MODIFICATION SERVICE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eSubaru made some interesting cost-cutting decisions when developing the FA20 cylinder heads. One such measure was the use of pressed in casting or \"freeze\" plugs on the head castings. These plugs are designed to cover the holes left during the casting process and contain the coolant inside the cylinder head. Unfortunately, the pressed in plugs have a tendency to become loose, and if they pop out you'll have oil and coolant mixing inside your timing cover and causing a huge mess and possibly costing you a new engine. We've developed a solution for this problem which involves carefully threading the opening for the casting plugs and installing new, threaded plugs that wont pop out. This is a must when going for higher horsepower in your FA20 equipped WRX. \u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"CEI\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-378.png\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eQUALITY GUARANTEED\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eWe stand behind every hand-built engine we produce. IAG's Standard Short Block Workmanship Warranty covers your short block for 12 months or 12,000 miles. We have also teamed up with a selection of IAG Certified Installation Facilities which offer up to a 24 month\/24,000 mile workmanship warranty when the engine is purchased, installed, and tuned by that IAG Certified Installer.\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePOWER RATING\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003ePower:The IAG 800 Cylinder Head Package has a power output rating of 800 BHP\u003c\/p\u003e\u003c\/div\u003e","brand":"IAG Performance","offers":[{"title":"Yes, Include Kelford A \"272\" Cams, Cam Towers, Lifters \u0026 Rockers","offer_id":48059171012826,"sku":"IAG-ENG-H800L","price":6999.99,"currency_code":"USD","in_stock":true},{"title":"No, I Only Want The Assembled Lower Portion of The Heads","offer_id":48059171045594,"sku":"IAG-ENG-H800E","price":4249.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/IAG-ENG-H800-OPT-01__00508.1678461718.1280.1280.jpg?v=1781530352"},{"product_id":"iag-1150-ej25-closed-deck-case-14mm-h-s-m-fire-lock-pinned-line-honed-arp-case-bolts-for-subaru-wrx-sti-lgt-fxt","title":"IAG 1150 EJ25 Closed Deck Case - 14mm H.S.M., Fire-Lock, Pinned + Line Honed, ARP Case Bolts- For Subaru WRX, STI, LGT, FXT","description":"\u003ch2 style=\"text-align:center;\"\u003eIAG 1150 EJ25 CLOSED DECK CASE\u003c\/h2\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cimg alt=\"IAG C1150 Closed Deck EJ25 Subaru Case\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/b19ad4cc-ff2d-496c-bfe4-919610586fb7\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eOUR STRONGEST CLOSED DECK CASE TO SUPPORT BIG POWER\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eIt's no secret that the OEM Subaru case halves, or \"block,\" aren't exactly the strongest. IAG has developed a process to greatly improve the strength of the OEM Subaru EJ25 Case Halves to combat the effects of high cylinder pressures brought on by increased power and boost. Our proprietary \"Closed Deck\" System works by supporting the top of the cylinder in the weakest areas and prevents movement and expansion which can lead to cracks and failures. Despite the additional material supporting the cylinder walls, there is no concerns with overheating or coolant flow because the area around the middle of the cylinder still maintains the same coolant area. The custom IAG closed deck inserts are machined with holes for oil and coolant to pass through the same as stock. The IAG 1150 EJ25 Closed Deck Case features threaded and indexed case bolt covers on top of our strongest closed deck inserts. We also machine the 1150 case for Fire-Lock head gaskets, 14mm head studs, and add pinned mains and ARP case hardware for ultimate strength. If you're one of those people who prefer to do your own builds we now offer our legendary closed deck case halves for purchase separately. Simply install your crank, rods, and pistons to your own specifications and be confident that the case halves will take the power and prevent common cylinder wall failures.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"IAG EJ25 Case Milled Out\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/df02d385-4134-422e-bee5-260edaafc00e\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eTHE IAG CLOSED DECK PROCESS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG Closed Deck conversion is performed 100% in-house by our engineers and experts using state-of-the-art equipment. The IAG Closed Deck starts with a new OEM EJ25 bare case. The case is loaded and fixtured to a 4th axis rotary indexer in our Haas VF4-SS CNC Vertical Machining Center. It is supported by the main journals using a precision ground 2-inch bar and tailstock which ensures the datum is the main journals. This method gives us a true reference point to perform all machining operations. A Rennishaw probe is utilized to check that the case is fixtured true, and once confirmed the machining process begins. \u003cbr\u003e\u003cbr\u003eOnce the case is fixtured, the first step is to mill out 12 pockets for CNC inserts. Rather than attempting to install inserts into an inconsistent cast case, the pockets are milled out to exact dimensions creating a consistent area that accepts our precision inserts. Once the pockets are machined, the case is removed from the mill and placed into a block oven at a low temperature. Our pre-machined closed-deck inserts are simultaneously chilled using dry ice. When the case and inserts have reached our desired temperature, they are moved into our install station, which holds the block and lightly presses the inserts into position on one side of the deck surface. This process is repeated on the other side and then the partially completed case is moved to a cooling rack. In the next step of our process, the case is loaded and fixtured back into the VF-4SS after reaching room temperature. During this stage, the flanges left from machining the inserts are milled close to the case deck surface. Features such as coolant passages and case bolt access positions are machined. Finally, each deck surface is machined true and flat using a Poly Crystal Diamond insert.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"IAG Fire-Lock Head Gasket System\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/2a68f708-0fce-479d-9061-b4dd08635498\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eFIRE-LOCK™ READY\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG 1150 EJ25 Closed Deck Case features our provisions for our proprietary \"Fire-Lock\" Head gasket system. This system has been proven in our record setting race cars to be the strongest Subaru head gasket system ever produced. To achieve these results our engineers separated the combustion chamber sealing from the fluid sealing aspects of the head gaskets. Our machinists carefully machine a lip at the top of each cylinder to accept the \"Fire-Lock\" ring. With the ring locked in place, it stands proud above the deck, providing a superior seal. The separate gasket bodies take care of sealing oil and coolant passages and keeping them out of the combustion chamber. The IAG 1150 Case is also machined to accept 14mm Head studs (Not Included) to ensure proper head gasket seal.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"IAG Ej25 Closed Deck Case Inserts\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/e5213713-12cd-4e85-b6a8-1b07c3350b50\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eSPECIALLY DESIGNED INSERTS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eOur machining process converts the semi-open deck to a complete closed deck and features the use of cast insert material that closely matches the metallurgy of the aluminum case material in a factory Subaru EJ engine block. By using a similar cast material (rather than billet), we ensure that during expansion and contraction the materials grow and shrink at similar rates, which is vital for maintaining roundness within the top of the bore. The outer inserts are machined from ¾\" cast material and the inner inserts from 1-inch cast material. Once the deck is surfaced, the result is a true ½ inch finished outer insert thickness and true ¾ inch finished inner insert thickness.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"IAG Closed Deck Case Pinning\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/6e8f3914-3d40-4ddf-baff-7a1899abf7c5\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePINNED MAINS AND ARP CASE HARDWARE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eWhen preparing an EJ25 OEM case to support 1150 BHP there are some additional steps which must be completed. One of the main problems with high powered Subarus is that the main bearing tunnel becomes out of round with the increased pressures exerted on them. To prevent this, our machinists add \"pins\" to keep the main journals aligned and also add ARP case hardware to ensure even clamping and support for the main bearings.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Case Half Sets Bored and Honed in IAG's Sunnen SV-30\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-875.jpg\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eFINAL BORE AND HONE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eEvery IAG Closed Deck case must be bored and honed after the closed deck process. During the closed deck process the cylinder walls become slightly distorted and an overbore must be performed to the correct this distortion and prepare the block to accept new pistons. EJ25 Case Halves must use 99.75mm pistons and EJ20 Case Halves must use 92.5mm pistons. IAG offers the Bore and Hone service with each of our closed deck case halves. When selected the case half set is fitted with custom deck plates and bored and honed in our state-of-the-art Sunnen SV-30 Computer Controlled Cylinder Hone. \u003cstrong\u003eYOU MUST PURCHASE OR SEND IN YOUR PISTONS FOR MEASUREMENT AND SIZING IF YOU SELECT THE BORE AND HONE OPTION.\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePOWER RATING\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003ePower:The IAG 1150 Closed Deck Case has a power output rating of 1150 BHP\u003c\/p\u003e\u003c\/div\u003e","brand":"IAG Performance","offers":[{"title":"Yes, Bore and Hone My Block (I Will Provide Pistons)","offer_id":48059176124634,"sku":"IAG-ENG-C115BH","price":4799.99,"currency_code":"USD","in_stock":true},{"title":"No","offer_id":48059176157402,"sku":"IAG-ENG-C115","price":4449.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/apigf6phh__00920.1633558483.1280.1280__86968.1678306032.1280.1280.jpg?v=1781530354"},{"product_id":"iag-950-ej25-closed-deck-case-14mm-h-s-m-fire-lock-for-subaru-wrx-sti-lgt-fxt","title":"IAG 950 EJ25 Closed Deck Case - 14mm H.S.M., Fire-Lock - For Subaru WRX, STI, LGT, FXT","description":"\u003ch2 style=\"text-align:center;\"\u003eIAG 950 EJ25 CLOSED DECK CASE\u003c\/h2\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cimg alt=\"IAG 950 Closed Deck Case Machined for Fire-Lock Head Gaskets and 14mm Head Studs\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/6b35444c-9f1c-4e25-b04b-5cc484d51192\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePLANNING TO BUILD YOUR OWN ENGINE? START HERE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eIt's no secret that the OEM Subaru case halves, or \"block,\" aren't exactly the strongest. IAG has developed a process to greatly improve the strength of the OEM Subaru EJ25 Case Halves to combat the effects of high cylinder pressures brought on by increased power and boost. Our proprietary \"Closed Deck\" System works by supporting the top of the cylinder in the weakest areas and prevents movement and expansion which can lead to cracks and failures. Despite the additional material supporting the cylinder walls, there is no concerns with overheating or coolant flow because the area around the middle of the cylinder still maintains the same coolant area. The custom IAG closed deck inserts are machined with holes for oil and coolant to pass through the same as stock. The IAG 950 Closed Deck Case takes the strength one step further by adding provisions for our race-proven Fire-Lock head gaskets system, along with modifications for 14mm head studs. If you're one of those people who prefer to do your own builds we now offer our legendary closed deck case halves for purchase separately. Simply install your crank, rods, and pistons to your own specifications and be confident that the case halves will take the power and prevent common cylinder wall failures.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Subaru Case Milled Out\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/3cee6225-541d-414a-adbe-56cc0cc0cf1a\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eTHE IAG CLOSED DECK PROCESS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG Closed Deck conversion is performed 100% in-house by our engineers and experts using state-of-the-art equipment. The IAG Closed Deck starts with a new OEM EJ25 bare case. The case is loaded and fixtured to a 4th axis rotary indexer in our Haas VF4-SS CNC Vertical Machining Center. It is supported by the main journals using a precision ground 2-inch bar and tailstock which ensures the datum is the main journals. This method gives us a true reference point to perform all machining operations. A Rennishaw probe is utilized to check that the case is fixtured true, and once confirmed the machining process begins. \u003cbr\u003e\u003cbr\u003eOnce the case is fixtured, the first step is to mill out 12 pockets for CNC inserts. Rather than attempting to install inserts into an inconsistent cast case, the pockets are milled out to exact dimensions creating a consistent area that accepts our precision inserts. Once the pockets are machined, the case is removed from the mill and placed into a block oven at a low temperature. Our pre-machined closed-deck inserts are simultaneously chilled using dry ice. When the case and inserts have reached our desired temperature, they are moved into our install station, which holds the block and lightly presses the inserts into position on one side of the deck surface. This process is repeated on the other side and then the partially completed case is moved to a cooling rack. In the next step of our process, the case is loaded and fixtured back into the VF-4SS after reaching room temperature. During this stage, the flanges left from machining the inserts are milled close to the case deck surface. Features such as coolant passages and case bolt access positions are machined. Finally, each deck surface is machined true and flat using a Poly Crystal Diamond insert.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"IAG Fire-Lock Head Gasket System\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/2a68f708-0fce-479d-9061-b4dd08635498\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eFIRE-LOCK™ READY\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG 950 EJ25 Closed Deck Case features our provisions for our proprietary \"Fire-Lock\" Head gasket system. This system has been proven in our record setting race cars to be the strongest Subaru head gasket system ever produced. To achieve these results our engineers separated the combustion chamber sealing from the fluid sealing aspects of the head gaskets. Our machinists carefully machine a lip at the top of each cylinder to accept the \"Fire-Lock\" ring. With the ring locked in place, it stands proud above the deck, providing a superior seal. The separate gasket bodies take care of sealing oil and coolant passages and keeping them out of the combustion chamber. The IAG 950 Case is also machined to accept 14mm Head studs (Not Included) to ensure proper head gasket seal.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Closed Deck Inserts\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/d60a1d78-b197-4ee9-af54-601b1c5a60d0\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eSPECIALLY DESIGNED INSERTS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eOur machining process converts the semi-open deck to a complete closed deck and features the use of cast insert material that closely matches the metallurgy of the aluminum case material in a factory Subaru EJ engine block. By using a similar cast material (rather than billet), we ensure that during expansion and contraction the materials grow and shrink at similar rates, which is vital for maintaining roundness within the top of the bore. The outer inserts are machined from ¾\" cast material and the inner inserts from 1-inch cast material. Once the deck is surfaced, the result is a true ½ inch finished outer insert thickness and true ¾ inch finished inner insert thickness.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Case Half Sets Bored and Honed in IAG's Sunnen SV-30\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-875.jpg\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eFINAL BORE AND HONE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eEvery IAG Closed Deck case must be bored and honed after the closed deck process. During the closed deck process the cylinder walls become slightly distorted and an overbore must be performed to the correct this distortion and prepare the block to accept new pistons. EJ25 Case Halves must use 99.75mm pistons and EJ20 Case Halves must use 92.5mm pistons. IAG offers the Bore and Hone service with each of our closed deck case halves. When selected the case half set is fitted with custom deck plates and bored and honed in our state-of-the-art Sunnen SV-30 Computer Controlled Cylinder Hone. \u003cstrong\u003eYOU MUST PURCHASE OR SEND IN YOUR PISTONS FOR MEASUREMENT AND SIZING IF YOU SELECT THE BORE AND HONE OPTION.\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePOWER RATING\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003ePower:The IAG 950 Closed Deck Case has a power output rating of 950 BHP\u003c\/p\u003e\u003c\/div\u003e","brand":"IAG Performance","offers":[{"title":"Yes, Bore and Hone My Block (I Will Provide Pistons)","offer_id":48059176059098,"sku":"IAG-ENG-C950BH","price":3499.99,"currency_code":"USD","in_stock":true},{"title":"No","offer_id":48059176091866,"sku":"IAG-ENG-C950","price":3099.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/apiabxpa9__01973.1633558627.1280.1280__05748.1678282055.1280.1280.jpg?v=1781530354"},{"product_id":"iag-750-ej25-closed-deck-case-11mm-h-s-m-for-subaru-wrx-sti-fxt-lgt","title":"IAG 750 EJ25 Closed Deck Case - 11mm H.S.M. - For Subaru WRX, STI, FXT \u0026 LGT","description":"\u003ch2 style=\"text-align:center;\"\u003eIAG 750 EJ25 CLOSED DECK CASE\u003c\/h2\u003e\n\u003chr style=\"border:none;border-top:1px solid #e0e0e0;margin:24px 0;\"\u003e\n\u003cimg alt=\"IAG 750 Closed Deck Case Half Set\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/0f321b9e-4d31-4231-a48e-815b6ed0d3f8\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePLANNING TO BUILD YOUR OWN ENGINE? START HERE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eIt's no secret that the OEM Subaru case halves, or \"block,\" aren't exactly the strongest. IAG has developed a process to greatly improve the strength of the OEM Subaru EJ25 Case Halves to combat the effects of high cylinder pressures brought on by increased power and boost. Our proprietary \"Closed Deck\" System works by supporting the top of the cylinder in the weakest areas and prevents movement and expansion which can lead to cracks and failures. Despite the additional material supporting the cylinder walls, there is no concerns with overheating or coolant flow because the area around the middle of the cylinder still maintains the same coolant area. The custom IAG closed deck inserts are machined with holes for oil and coolant to pass through the same as stock. If you're one of those people who prefer to do your own builds we now offer our legendary closed deck case halves for purchase separately. Simply install your crank, rods, and pistons to your own specifications and be confident that the case halves will take the power and prevent common cylinder wall failures.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/1fc9358a-e7e3-4661-810a-23e3746f6aa2\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eTHE IAG CLOSED DECK PROCESS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eThe IAG Closed Deck conversion is performed 100% in-house by our engineers and experts using state-of-the-art equipment. The IAG Closed Deck starts with a new OEM EJ25 bare case. The case is loaded and fixtured to a 4th axis rotary indexer in our Haas VF4-SS CNC Vertical Machining Center. It is supported by the main journals using a precision ground 2-inch bar and tailstock which ensures the datum is the main journals. This method gives us a true reference point to perform all machining operations. A Rennishaw probe is utilized to check that the case is fixtured true, and once confirmed the machining process begins. \u003cbr\u003e\u003cbr\u003eOnce the case is fixtured, the first step is to mill out 12 pockets for CNC inserts. Rather than attempting to install inserts into an inconsistent cast case, the pockets are milled out to exact dimensions creating a consistent area that accepts our precision inserts. Once the pockets are machined, the case is removed from the mill and placed into a block oven at a low temperature. Our pre-machined closed-deck inserts are simultaneously chilled using dry ice. When the case and inserts have reached our desired temperature, they are moved into our install station, which holds the block and lightly presses the inserts into position on one side of the deck surface. This process is repeated on the other side and then the partially completed case is moved to a cooling rack. In the next step of our process, the case is loaded and fixtured back into the VF-4SS after reaching room temperature. During this stage, the flanges left from machining the inserts are milled close to the case deck surface. Features such as coolant passages and case bolt access positions are machined. Finally, each deck surface is machined true and flat using a Poly Crystal Diamond insert.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"\" loading=\"lazy\" src=\"https:\/\/i.shgcdn.com\/f3fa0050-3475-4c32-ae59-e461fefe53fa\/-\/format\/auto\/-\/preview\/3000x3000\/-\/quality\/lighter\/\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eSPECIALLY DESIGNED INSERTS\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eOur machining process converts the semi-open deck to a complete closed deck and features the use of cast insert material that closely matches the metallurgy of the aluminum case material in a factory Subaru EJ engine block. By using a similar cast material (rather than billet), we ensure that during expansion and contraction the materials grow and shrink at similar rates, which is vital for maintaining roundness within the top of the bore. The outer inserts are machined from ¾\" cast material and the inner inserts from 1-inch cast material. Once the deck is surfaced, the result is a true ½ inch finished outer insert thickness and true ¾ inch finished inner insert thickness.\u003c\/p\u003e\u003c\/div\u003e\n\u003cimg alt=\"Case Half Sets Bored and Honed in IAG's Sunnen SV-30\" loading=\"lazy\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/Unknown-875.jpg\" style=\"display:block;margin:0 auto;\"\u003e\n\u003ch2 style=\"text-align:center;\"\u003eFINAL BORE AND HONE\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003eEvery IAG Closed Deck case must be bored and honed after the closed deck process. During the closed deck process the cylinder walls become slightly distorted and an overbore must be performed to the correct this distortion and prepare the block to accept new pistons. EJ25 Case Halves must use 99.75mm pistons and EJ20 Case Halves must use 92.5mm pistons. IAG offers the Bore and Hone service with each of our closed deck case halves. When selected the case half set is fitted with custom deck plates and bored and honed in our state-of-the-art Sunnen SV-30 Computer Controlled Cylinder Hone. \u003cstrong\u003eYOU MUST PURCHASE OR SEND IN YOUR PISTONS FOR MEASUREMENT AND SIZING IF YOU SELECT THE BORE AND HONE OPTION.\u003c\/strong\u003e\u003c\/p\u003e\u003c\/div\u003e\n\u003ch2 style=\"text-align:center;\"\u003ePOWER RATING\u003c\/h2\u003e\n\u003cdiv class=\"product-text\"\u003e\u003cp\u003ePower:The IAG 750 Closed Deck Case has a power output rating of 750 BHP\u003c\/p\u003e\u003c\/div\u003e","brand":"IAG Performance","offers":[{"title":"Yes, Bore and Hone My Block (I Will Provide Pistons)","offer_id":48059176878298,"sku":"IAG-ENG-C750BH","price":2999.99,"currency_code":"USD","in_stock":true},{"title":"No","offer_id":48059176911066,"sku":"IAG-ENG-C750","price":2749.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/8623\/0234\/files\/api683ojf__43266.1633558694.1280.1280__19449.1678282337.1280.1280.jpg?v=1781530354"}],"url":"https:\/\/www.iagperformance.com\/collections\/iag-cylinder-heads-case-halves-featured.oembed","provider":"IAG Performance","version":"1.0","type":"link"}