IAG 800 Series FA20 (10.5:1 Compression Ratio) Closed Deck Short Block 13-21 BRZ / FRS / GT86

IAG 800 Series FA20 (10.5:1 Compression Ratio) Closed Deck Short Block 13-21 BRZ / FRS / GT86

The IAG 800 Series short block is a closed deck FA20 bottom end for 2013-2021 Subaru BRZ, Scion FR-S and Toyota GT86 cars with larger aftermarket turbochargers. This version uses 10.5:1 pistons, which IAG designs for high boost and big turbo setups. It is built to withstand the higher cylinder pressure of fully bolted-on, upgraded-turbo builds.

Build details

• Case halves: Brand new OEM Subaru FA20, machined for improved oiling, with internal oil passages inspected and optimized
• Closed deck: IAG Closed Deck Inserts machined in on a Haas VF-4SS CNC mill; coolant flow is retained
• Head sealing: O-ring grooves cut into the deck; case machined and tapped for 1/2" head studs
• Bore: 86.1mm, bored and honed on a Sunnen SV-30
• Pistons: IAG-Spec JE FSR 86.1mm forged, 2618 T6 alloy, asymmetrical skirts, ring set; wrist pins .905 x 2.250 x .210 in. with Tru Arc locks
• Compression ratio: 10.5:1 on standard gasket thickness
• Connecting rods: IAG-Spec H-Beam forged with ARP2000 rod bolts
• Bearings: ACL or King XPG rod bearings; OEM or King XPG main bearings
• Crankshaft: New Subaru FA20 (2020+)
• Hardware: Standard Subaru case bolts; OEM oil plug pre-installed at the oil pan location

Before you order

Listed for 2013-2021 BRZ, FR-S and GT86 with the FA20. The 1/2" head studs are sold separately. The 10.5:1 figure assumes a standard-thickness head gasket, and the lower ratio is intended for high-boost use. Send us your VIN or engine code and we will confirm fitment before you order.

See also: FA20 vs EJ25 · head studs vs head bolts · is it worth replacing an engine? · signs of a blown head gasket · Subaru BRZ and Toyota GR86 parts · FA20 vs FA24 · subaru fa20 / fa24 · IAG Performance Subaru blocks and all engines by engine code.

Shipping and returns

Shipping is a flat $80.00 per order to US addresses, and returns are free within 15 days of delivery. Questions before you order? Ask a parts specialist.