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IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX
IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX
IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX
IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX
IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX
IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX
IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX
IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX
IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX
IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX
IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX
IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX
IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX
IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX

IAG STAGE 2.5 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-18 WRX

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IAG Stage 2.5 FA20 DIT Closed Deck Short Block


The IAG Stage 2.5 short block starts with new Subaru FA 2.0L engine case halves, 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. Next, the short block is Deck Plate bored and honed that 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 2015-18 Subaru 2.0L WRX 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, IAG-Spec 86.1mm forged pistons are spec'd and installed along with an OEM oil plug finishing off the short block. 

Stage 2.5 FA20 Includes:

  • Case Halves - Converted to Closed Deck using brand new Subaru OEM case halves, bored and honed to 86.1mm
  • Pistons - IAG-Spec 86.1mm Forged Pistons, Ring Set, and .150" x 2.250" Chromoly Wrist Pins.
  • Connecting Rods - Brian Crower H-Beam / ARP2000 Rod Bolts
  • Rod - ACL or King XPG
  • Main Bearings - King XPG
  • Crankshaft - New Subaru FA20 DIT WRX 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 - (x1) 11021AA190 Plug, (x2) 11024AA141 Plugs , (x1) 806792010 Rear Main Seal - $36.99
  • Head Gaskets -



Compression Ratio: 

  • 10.0:1 (.6 lower than stock compression) on standard gasket thickness.


Power: The IAG Stage 2.5 Short Block has a power output rating of 675BHP