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IAG Performance

IAG - Subaru 13-20 BRZ - Stage 1 FA20 Subaru Short Block

IAG - Subaru 13-20 BRZ - Stage 1 FA20 Subaru Short Block


Regular price $3,989.99 USD
Regular price Sale price $3,989.99 USD
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IAG Stage 1 FA20 Short Block

The IAG Stage 1 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 86.1mm 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. IAG-Spec 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, lower compression IAG-Spec 86.1mm 10.5:1 compression ratio forged pistons are spec'd and installed finishing off the short block. The lower compression ratio is good for BRZ / FR-S forced induction conversion applications.

Stage 1 FA20 Includes:

  • Case Halves -Brand new OEM Subaru BRZ FA20 case halves
  • Case Machining - Modified for improved oiling
  • Case Machining - Bored and honed to 86.1mm
  • Compression Ratio: 10.01
  • Pistons -IAG-Spec 86.1mm 10.5:1 Forged Pistons, Ring Set, and .150" x 2.250" Chromoly Wrist Pins
  • Connecting Rods -IAG-Spec 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 - comes preinstalled at the oil pan location

Additional Options Available:

  • Oil Plugs & Rear Main Seal - (x2) 11024AA141 Plug, (x1) 806792010 Rear Main Seal

Compression Ratio:

  • 10.5:1 (2 points lower than stock compression) on standard gasket thickness.

Power: The IAG Stage 1 Short Block has a power output rating of 550BHP.



  • Subaru 13-20 BRZ
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