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 86.25mm 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 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 86.25mm 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 86.25mm
• O-Ringing - Machine and O-Ring Deck Surface
• Head Studs - Machine Case to 1/2" head studs - *Head studs are required and sold separately
• Pistons - IAG-Spec 86.25mm 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

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

Additional Options Available:

• Head Studs - IAG Performance 1/2" head stud set manufactured by ARP (Sold Separately)
• Oil Plugs & Rear Main Seal kit (Sold Separately):
  • (1) 11021AA190 Plug
  • (2) 11024AA141 Plugs
  • (1) 806792010 Rear Main Seal

Note: All IAG Short Blocks are balanced and blueprinted.

Please review the PDF document below regarding installation, break-in procedures and warranty information.