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IAG Stage 3 Extreme FA20DIT Subaru Closed Deck Short Block - 15-18 WRX

The IAG Stage 3 Extreme 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. 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 86.1mm 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. 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, IAG-Spec 86.1mm forged pistons are spec'd and installed along with an OEM oil plug finishing off the short block. 

Stage 3 Extreme FA20 Includes:
  • Case Halves - Converted to Closed Deck using brand new Subaru OEM case halves, bored and honed to 86.1mm
  • O-Ringing - Machine and O-Ring Deck Surface
  • Head Studs - Machine Case to 1/2" head studs - * Head studs are sold separately
  • Pistons - IAG-Spec 86.1mm Forged Pistons, Ring Set, and .150" x 2.250" Chromoly Wrist Pins.
  • Connecting Rods - Manley I-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 Studs - IAG Performance 1/2" head stud set manufactured by ARP - $499.99
Compression Ratio: 
  • 10.0:1 (.6 lower than stock compression) on standard gasket thickness.
Power: The IAG Stage 3 Extreme Short Block has a power output rating of 800BHP 

*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 



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