IAG Performance Stage 3 FA20 "EXTREME" Closed Deck Short Block - WRX VA (15-20)
The IAG Stage 3 Extreme short block starts with new Subaru FA 2.0L engine case halves that are machined for improved oiling. Then 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 2015-19 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
- Case Machining - Modified for improved oiling
- Case Machining - 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 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
Additional Options Available:
- Oil Plugs & Rear Main Seal - (x1) 11021AA190 Plug, (x2) 11024AA141 Plugs , (x1) 806792010 Rear Main Seal
- Head Studs - IAG Performance 1/2" head stud set manufactured by ARP
- The IAG Stage 3 Extreme Short Block has a power output rating of 800BHP
- All IAG Short Blocks are balanced and blueprinted.
- Compression Ratio: 10.6:1 (stock compression) on standard gasket thickness.