IAG Stage 3 Extreme FA20 DIT Subaru Closed Deck Short Block

2015-2021 Subaru WRX

Ships for free in the 48 states

SKU: IAG-ENG-1313We price match!

On order from MFG
Average time to ship: 17 business days

IAG Stage 3 Extreme FA20 DIT Closed Deck Short Block
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IAG Stage 3 Extreme FA20 DIT Closed Deck Short Block


  • Brand new OEM Subaru WRX FA20 case halves converted to Closed Deck
  • Bored and honed to 86.25mm
  • IAG-Spec 86.25mm Forged Pistons
  • 10.6:1 compression ratio
  • .150" x 2.250" Chromoly wrist pins
  • Manley I-beam connecting rods
  • ARP2000 rod bolts
  • New 2015-18 Subaru 2.0L WRX crankshaft
  • Matched with ACL Main and Rod Bearings
  • Standard Subaru case bolts
  • Machined for 1/2" head studs (not included)
  • O-Ring deck surface
  • Built to sustain more power and more boost



The IAG Stage 3 Extreme FA20 DIT Closed Deck Short Block starts with brand new OEM Subaru WRX case halves and takes it through their in-house closed deck conversion process. This utilizes top-of-the-line tools such as a Haas VF-4SS CNC mill to prep for the IAG closed deck inserts, cut O-ring receiver grooves, and drill and tap for 1/2" head studs. All of this provides a motor designed to greatly reduce head gasket failure during high cylinder pressure scenarios. The block then goes on their Sunnen SV-30 for the best bore and hone available.

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