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IAG Stage 2 FA20 Short Block
The IAG Stage 2 short block starts with new Subaru FA 2.0L BRZ engine case halves that are machined for improved oiling. Then the case is bored and honed to 86.25mm on our in-house Sunnen SV-30 the most advanced automotive cylinder hone available. IAG‘s in-house honing process is able to set piston to wall clearances tighter for a quieter running engine. The short block is measured and assembled using a new FA20 WRX / BRZ Subaru crankshaft that is matched to King main bearings. Brian Crower H-Beam rods with ARP2000 rod bolts are utilized along with King or ACL rod bearings. The case halves are sealed with new OEM case bolts and sealant. Finally, standard compression IAG-Spec 86.25mm 12.5:1 compression ratio forged pistons are spec'd and installed along with an OEM oil plug finishing off the short block.
Stage 2 FA20 Includes:
- Case Halves - Brand new OEM Subaru BRZ FA20 case halves, bored and honed to 86.25mm
- Case Machining - Modified for improved oiling
- Case Machining - Bored and honed to 86.25mm
- Pistons - IAG-Spec 86.25mm 12.5:1 Forged Pistons, Ring Set, and 1.50" x 2.250" Chromoly Wrist Pins
- Connecting Rods - Brian Crower H-Beam / ARP2000 Rod Bolts
- Rod Bearings - ACL or KING XPG
- Main Bearings - King XPG
- Crankshaft - New Subaru FA20 WRX / BRZ crankshaft
- Case / Main Bolts - Standard Subaru case bolts
- Hardware - OEM Oil Plug - preinstalled at the oil pan location.
Additional Options Available:
- Oil Plugs & Rear Main Seal - (x2) 11024AA141 Plug, (x1) 806792010 Rear Main Seal - $34.99
Compression Ratio:
- 12.5:1 (Standard Compression) on standard gasket thickness.
Power: The Stage 2 Short Block has a power output rating of 600BHP
*All IAG Short Blocks are balanced and blueprinted.
Please review the PDF document below regarding installation, break-in procedures and warranty information.
 PDF After Sale Document - Contains Shipping, Engine Care and Warranty Information
 WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and reproductive harm. For more information, visit www.P65Warnings.ca.gov.
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IAG SHORT BLOCK WARRANTY INFORMATION, TERMS & CONDITIONSIAG Performance is confident in our products and services and we proudly stand behind our workmanship. Therefore, we offer a limited warranty against defects in workmanship or materials, covering both parts and labor, for a standard period of 1-Year/12,000-Miles or an enhanced warranty of 2-Years/24,000-Miles if installed by an IAG Certified Engine Installer.
IAG (Standard) Short Block Warranty Limitations are as follows:
- Standard Warranty period begins on the day the engine was delivered.
- Standard Warranty applies only to short block components manufactured and assembled by IAG Performance.
- Standard Warranty does not extend to any other part of the engine, turbocharger, accessories, or vehicle in which the engine is installed, or subsequent damage to any component or part of the vehicle due to an engine failure.
- Standard Warranty coverage excludes any shipping costs incurred to return the product to our facility. If the warranty claim is denied, the client will be responsible for return shipping from our facility.
- Standard Warranty coverage excludes any and all labor expenses needed for reassembly, as well as any components (i.e. gaskets, fluids, etc.) required for reinstallation.
- Standard Warranty is only offered if the short block is professionally installed, with receipts provided.
- Standard Warranty is non-transferrable and only offered to the original purchaser of the engine.
- All parts used in the assembly of the IAG built short block carry the manufacturer’s individual component warranties. No warranty is expressed or implied for any customer-supplied components.
- Standard Warranty clients are responsible for initiating a warranty claim with IAG directly.
- The client agrees that they will be held responsible for all engine tear down costs for claims deemed insufficient and/or invalid.
- Proof of proper maintenance is the owner’s responsibility.
- Any covered repairs or replacement will not extend the warranty period.
- You must register your engine by completing the online form at https://www.iagperformance.com/warranty
IAG Certified Engine Installer (Enhanced) Warranty Limitations are as follows:
- The Enhanced Warranty Program is only available for engines sold and installed after 5-1-2019. Engines purchased and installed prior to 5-1-2019 will still qualify for the Standard Engine Warranty Program
- Enhanced Warranty period begins on the day the vehicle is completed and delivered to the client by the IAG Certified Engine Installer (as evidenced by client receipts.)
- The installer must register the engine by completing the online form at https://www.iagperformance.com/warranty
- Enhanced Warranty applies only to short block components manufactured and assembled by IAG Performance.
- Enhanced Warranty does not extend to any other part of the engine, turbocharger, accessories, or vehicle in which the engine is installed, or subsequent damage to any component or part of the vehicle due to an engine failure.
- Enhanced Warranty coverage excludes any shipping costs incurred to return the product to our facility. If the warranty claim is denied, the client will be responsible for return shipping from our facility.
- Enhanced Warranty coverage includes limited labor expenses needed for reassembly, as well as any gaskets required for reinstallation.
- Enhanced Warranty is only offered if the short block is professionally installed by an IAG Certified Engine Installer, with receipts provided.
- Enhanced Warranty is non-transferrable and only offered to the original purchaser of the engine.
- All parts used in the assembly of the IAG built short block carry the manufacturer’s individual component warranties. No warranty is expressed or implied for any customer-supplied components.
- Enhanced Warranty claims must be initiated by an IAG Certified Engine Installer ONLY.
- The client agrees that they will be held responsible for all engine tear down costs for claims deemed insufficient and/or invalid.
- Proof of proper maintenance is the owner’s responsibility.
- Any covered repairs or replacement will not extend the warranty period.
IAG Short Block Warranty does NOT cover:
- Damage due to improper engine installation, negligence, abuse, alteration or accident.
- Improper or insufficient engine break-in (failure to follow assigned break-in procedure, including oil changes.)
- Damage resulting from improper engine tuning including, piston skirt scuffing, damage indicated by head gaskets exhibiting burned or crushed fire ring(s), or damage caused by improper combustion, detonation, pre-ignition or extreme cylinder pressures, as indicated by melted, broken, or eroded pistons or bent wrist pins/worn wrist pin bushings.
- Damage resulting from improper transmission installation or clutch adjustment, including crankshaft thrust bearing damage on transmission side only.
- Damage caused by lack of proper maintenance, failure to follow scheduled maintenance intervals or failure to use or maintain proper type and levels of fluids, fuel, oil, and lubricants, including accelerated wear from contaminated oil or fuel wash.
- Damage caused by the failure of other engine related components, such as fuel injectors or pump, wiring, water pump, oil pump, sensors, or gaskets.
- Damage related failure to replace contaminated oiling components. Oiling components may include oil pump, oil cooler, oil pick up, oil pan, oil-driven AVCS cam gears, screened banjo bolts and all other contaminated oiling related components depending on the model year and layout of the vehicle.
- Engine damage without documentation of professional installation, including proof of purchase of replacement oiling components. Proof of proper maintenance is the owner’s responsibility.
- Damage due to abuse, including over-rev, overheating, lean conditions or oil starvation.
- Engines where the odometer has been disconnected or mileage has been altered.
- Failure caused by short block or cylinder head casting flaw or failure.
- Damage caused by vehicle collisions or other accidental damage, including shipping damage.
- Damage caused by foreign objects dropped or drawn into cylinders or the crankcase, including water or other fluids.
- Towing, shipping, rental vehicles, loss of time, inconvenience, loss of use or other economic loss to the extent allowed by law.
- Damage to subsequent components, such as a turbocharger or wastegate, due to failure of an engine or engine component.
Standard Warranty Claim ProcedureAll Standard Warranty claims must be directed to IAG Performance for assignment of a return merchandise authorization number (RMA). Following the issuance of an RMA claim number, IAG requires the engine to be returned to our facility for inspection and final determination of claim eligibility. The client is responsible for all shipping and handling costs to return the engine back to IAG. Upon receipt of the engine, IAG will disassemble the engine to determine if product manufacturing, assembly, parts defect, improper installation, or improper tuning directly or indirectly caused the engine to prematurely fail. After engine teardown is complete IAG will determine whether warranty coverage applies.
Enhanced Warranty Claim ProcedureAll Enhanced Warranty claims must be directed to an IAG Certified Engine Installer for assignment of a return merchandise authorization number (RMA). Following the issuance of an RMA claim number, IAG requires the engine to be returned to our facility for inspection and final determination of claim eligibility. The client must authorize the Certified Engine Installer to remove the engine from the vehicle. The client is responsible for all shipping and handling costs to return the engine to IAG. Upon receipt of the engine, IAG will disassemble the engine to determine the cause of failure. After engine teardown is complete, IAG will determine whether warranty coverage applies. If the engine is deemed to be covered under warranty, IAG will reimburse the Certified Engine Installer for a pre-determined cost of labor. If the engine is not deemed to be covered under this limited warranty, the client will be responsible for all labor costs associated with the removal and reinstallation of the engine or components.
Address for Engine Warranty ShippingIAG Performance RMA# ATTN: Warranty Dept 1241 New Windsor Rd Westminster, MD 21158
Model Year & Fitment
- 2013 Subaru BRZ / FR-S
- 2014 Subaru BRZ / FR-S
- 2015 Subaru BRZ / FR-S
- 2016 Subaru BRZ / FR-S
- 2017 Subaru BRZ / FR-S
- 2018 Subaru BRZ / FR-S
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