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IAG Performance S3X FA20 Short Block Stage 3 Extreme FA20 Subaru Closed Deck Short Block (10.5:1 Compression Ratio)

Engine Short Block


IAG Stage 3 Extreme FA20 Subaru Closed Deck Short Block for 2013-20 BRZ / FR-S / GT86 (10.5:1 Compression Ratio).

  • All IAG Short Blocks are balanced and blueprinted
  • Compression Ratio: 10.5:1 (2.0 lower than stock compression) on standard gasket thickness
  • The Stage 3 Extreme Short Block has a power output rating of 800BHP
  • This short block features a lower compression and is intended for forced induction applications.
Pricing: $5,999.99

Free ground shipping on all order over $100.00 (some exclusions may apply)


Toyota: 86 17 - 20, Subaru: BRZ 13 - 20, Scion: FR-S 13 - 16

Stage 3 Extreme FA20 Includes: Case Halves - Converted to Closed Deck using brand new Subaru OEM case halves, Case Machining - Modified for improved oiling Case Machining - Bored and honed to 86.25mm - Machine and O-Ring Deck Surface, Head Studs - Machine Case for 1/2" head studs - Head studs are sold separately, Pistons - 86.25mm 10.5:1 Forged Pistons, Ring Set, and 1.50" x 2.250" Chromoly Wrist Pins, Connecting Rods - Manley I-Beam / ARP2000 Rod Bolts, Rod Bearings - ACL or KING XPG, Main Bearings - IAG Spec, Crankshaft - New Subaru FA20 WRX / BRZ crankshaft, Case / Main Bolts - Standard Subaru case bolts Hardware - OEM Oil Plug - preinstalled at the oil pan location.

IAG Stage 3 Extreme FA20 Closed Deck Short Block The IAG Stage 3 Extreme short block starts with new Subaru FA 2.0L BRZ engine case halves that are machined for improved oiling. Then IAG machines the case halves assembled together in our Haas VF-4SS CNC mill to accept the IAG CLOSED Deck Inserts that transform the block into a solid deck. The unique inserts feature small passages that allow needed coolant flow to the deck surface. The case halves are then CNC machined with O-ring receiver grooves around the bore surface as well as drilled and tapped to accept 1/2" head studs that greatly reduce head gasket failure during high cylinder pressure scenarios. Next, the short block is Deck Plate bored and honed that 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 modified case halves are then measured and assembled using a new FA20 WRX / BRZ Subaru crankshaft that is matched to King main bearings. Manley I-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 86.25mm 10.5:1 compression ratio forged pistons are spec'd and installed along with an OEM oil plug finishing off the short block. The lower compression ratio is good for BRZ / FR-S forced induction conversion applications.


  • IAG-ENG-1323
  • IAG-ENG-1323
  • 887753778246
  • IAG Performance
  • New


Shipping Information

  • Item Requires Shipping
  • 105.0 lbs.
  • W19.0000” x H16.0000” x L19.0000”
  • Free ground shipping on all order over $100.00 (some exclusions may apply)

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