The IAG Stage 1 short block starts with new Subaru FA 2.0L engine case halves that are bored and honed 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. IAG-Spec 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 1 FA20 Includes:

• Case Halves - Brand new OEM Subaru FA20 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 - IAG-Spec H-Beam with ARP2000 Rod Bolts
• Rod Bearings - 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 - preinstalled at inner oil pan location

Compression Ratio:

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

Power:

• The IAG Stage 1 Short Block has a power output rating of 550BHP.

Additional Options Available:

• 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.