Cylinder Heads & Parts

The IAG Long Block Engine Basic Installation Kits provide all of the basic components needed to install one of our EJ25 Long Block Engine Packages in one complete kit. All fluids for initial break-in are included. Just select the kit which fits your year...

The IAG Long Block Engine Basic Installation Kits provide all of the basic components needed to install one of our FA20F DIT WRX Long Block Engine Packages in one complete kit. All fluids for initial break-in are included. Components Included: (x2)...

The IAG Performance / JE Pro Seal Subaru MLS head gaskets were designed specifically for use with IAG's 14mm Head Stud Sets. The gaskets are manufactured from stainless steel material and feature enlarged head stud holes to clear 14mm head studs without...

The IAG Performance / JE Pro Seal Subaru MLS head gaskets were designed specifically for use with IAG's 14mm Head Stud Sets. The gaskets are manufactured from stainless steel material and feature enlarged head stud holes to clear 14mm head studs without...

After years of research and development testing, the IAG Performance Fire-Lock™ head gasket is the newest solution to preventing head gasket failure on high horsepower and high boost Subaru EJ25 engines. This solution is loosely derived from diesel...

The IAG Performance Fire-Lock head gasket solution was created after years of research and development testing to prevent head gasket failure on high horsepower and high boost Subaru EJ Series engines. This solution is loosely derived from diesel...

The IAG Performance Cooper ring head gasket is manufactured from an asbestos-free composite raw material and features silicone based beading applied to critical areas to improve sealing around all water and oil passages. What sets this gasket apart from...

The IAG Copper O-Ring Wire & Install Tool Kit is intended for use with our case halves or short blocks. The kit includes (4) lengths of copper o-ring wire and a wooden tool handle end intended to press the o-ring wire into the machined groove without...

IAG 1150 CNC PORTED DRAG CYLINDER HEADS PACKAGE FOR 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT window...

IAG 950 CNC PORTED RACE CYLINDER HEADS PACKAGE FOR 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT window...

IAG 750 CNC POCKET PORTED COMPETITION CYLINDER HEADS PACKAGE FOR 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT ...

IAG 550 STREET CYLINDER HEADS PACKAGE FOR 02-14 WRX, 04-21 STI, 05-09 LGT, 04-13 FXT window...

IAG 800 POCKET PORTED COMPETITION CYLINDER HEADS PACKAGE FOR 2015-2021 SUBARU WRX window...

IAG 600 STREET CYLINDER HEADS PACKAGE FOR 2015-2021 SUBARU WRX window.SHOGUN_IMAGE_ELEMENTS = window...

IAG billet aluminum half moon valve cover cam seals replace the OEM style rubber seals that are prone to leaking and failure as they age. The seal set comes in a complete set of four and features black anodized oem like finish.

IAG billet aluminum half moon valve cover cam seals replace the OEM style rubber seals that are prone to leaking and failure as they age. Sold in a complete set of four. (Silver Finish)

IAG AVCS Camshaft Sensor Plugs (Pair). Designed for early 2002-2005 WRX's that have upgraded to AVCS cylinder heads but do not have engine management to support AVCS sensors. Comes in a black anodized finish. Includes: (x2) CNC Billet Plugs (x2) O-ring...

The Subaru FA20 cylinder heads use pressed-in freeze plugs from the factory. It's common for the plugs to fall out, lose coolant externally or even internally into the oil. Unfortunately, most of the freeze plugs are located behind the timing cover and...

GSC set out to create the best performance, longest lasting Subaru oversize (+1) 37mm intake valves available to the aftermarket. Using advanced 3D design and simulation programs GSC created a stronger and higher flowing valve head design. GSC flow tests...

GSC set out to create the best performance, longest lasting Subaru intake valves available to the aftermarket. Using advanced 3D design and simulation programs GSC created a stronger and higher flowing valve head design. GSC flow tests prototype valve...

Running high horsepower with high EGT's requires a valve that will last in 2000F conditions. GSC 33mm +1 Oversize Super Alloy Exhaust valves have chrome polished stems to create a smooth, durable finish for added life and better lubricity especially when...

Running high horsepower with high EGT's requires a valve that will last in 2000F conditions. GSC 32mm standard size Super Alloy Exhaust valves have chrome polished stems to create a smooth, durable finish for added life and better lubricity especially...

Manley Race Flo 37mm Intake Valve Set For Subaru WRX / STI (8). Manley Intake valves are made from NK-842 Stainless, are Swirl Polished, Fully Machined, feature Chrome Stems and Hard Tips.Type: Intake Head Diameter: 37mmStem Diameter: 6.0mm/...

Manley Extreme Duty 33mm Exhaust Valve Set WRX / STI (8) . Manley valves are made from an ExtremeAlloy XH-426 Stainless. The valves feature swirl polishing, are fully machined with chrome stems and hard tips.Type: exhaustHead Diameter: 33mm Stem...

GSC Power-Division Beehive valve springs use an ovate wire which utilizes advanced material heat treatment methods for superior load loss capabilities. GSC springs have the highest level of spring load retention while still maintaining good fatigue threw...

Brian Crower Spring and Retainers Valve Springs: Designed for high rpm, Brian Crower valve springs are wound from only the highest grade, super clean, chrome silicone alloy and feature proprietary processing procedures (chamfer, debur, etc...) for...

Kelford's Beehive valve spring and titanium retainer set is designed to fit EJ20 and EJ25 Subaru's. The springs are manufactured from "PACALOY" ovate wire, featuring nano-peen and gold nitride surface finishing treatments for superior endurance. The...

Kelfords high performance valve spring set is designed as drop in fit utilizing the OEM retainer. The "PACALOY" springs feature a 85lbs. seat pressure at 36.00mm install height and coil bind occurs at 22.00mm. The springs are good for up to 25lbs. of...

GSC Power-Division's Single, Cylindrical Spring kit is designed for the 2.0L FA20 engines found in the 2015-21 Subaru WRX and 2013-20 Subaru BRZ / FRS. These are great for boosted applications or high revving NA engines needing more spring with out...

GSC Power-Division Spring Seats are now available for the Subaru Turbo EJ series. The GSC1005 is an OEM replacement stamped spring seat, usable with GSC Power-Division 5043 or 5743 upgraded valve spring kits or stock springs as an alternative to...