IAG 800 FA20 Subaru Closed Deck Short Block - 800 BHP

IAG 800 FA20 Closed Deck Short Block for 2013-20 BRZ / FR-S / GT86 (12.5:1 Compression Ratio)

DESIGNED FOR HIGH-BOOST FA20 APPLICATIONS

The IAG 800 FA20 Short Block is engineered for modified FA20 Subaru BRZ, Scion FR-S, and Toyota 86 platforms that demand increased strength and durability under high cylinder pressures. Featuring IAG’s proprietary closed-deck cylinder support system, this short block reinforces the OEM FA20 cylinder walls to handle the stresses associated with larger turbochargers and aggressive power goals. :contentReference[oaicite:0]{index=0}

Fitted with IAG Spec H-Beam forged connecting rods and high-quality internal machining, the IAG 800 short block delivers a strong foundation for boosted builds targeting up to 800 BHP when paired with the proper supporting modifications. :contentReference[oaicite:1]{index=1}

BUILT WITH 100% NEW COMPONENTS

Each IAG 800 Short Block begins with brand-new FA20 Subaru 2.0L engine case halves, machined for improved oil passage flow and strength. The block is assembled and machined in a Haas VF-4SS CNC mill to accept closed deck inserts that transform the block into a solid deck configuration. :contentReference[oaicite:2]{index=2}

After closed-deck installation, the block is bored and honed to 86.1 mm using IAG’s in-house Sunnen SV-30 honing equipment to achieve precise piston-to-wall tolerances for quiet operation and durability. The assembled case halves are sealed with new OEM case bolts and sealant prior to final piston and rod installation. :contentReference[oaicite:3]{index=3}

FIRE-LOCK™ & HEAD STUD READY

To enhance head gasket sealing under elevated cylinder pressures, the short block is machined with o-ring receiver grooves around the bore surface and drilled to accept 1/2" head studs (studs sold separately). This machining approach reduces the risk of head gasket failure under high-boost conditions. :contentReference[oaicite:4]{index=4}

MODIFIED OIL PASSAGES FOR RELIABILITY

Proper internal oiling is critical for high-performance engines. IAG’s machinists carefully inspect and modify the internal oil passages of each FA20 OEM case to ensure improved oil flow and reliability for performance use. :contentReference[oaicite:5]{index=5}

FORGED PISTONS, DESIGNED FOR BOOST

The IAG 800 FA20 Short Block features IAG Spec JE FSR 86.1 mm forged pistons made from 2618 T6 alloy, designed to withstand increased cylinder pressures without sacrificing strength. The pistons include an asymmetrical skirt design to reduce moving mass, and are equipped with .905 x 2.250" x .210" wall carbon steel wrist pins with Tru Arc locks. :contentReference[oaicite:6]{index=6}

IAG 800 FA20 CLOSED DECK SHORT BLOCK INCLUDES

What's Inside:

Case Halves – Brand new OEM Subaru FA20 case halves, bored & honed to 86.1 mm
Case Machining – Modified for improved oiling
Closed Deck – Machine case for closed deck inserts
O-Ring Grooves – CNC machined o-ring receiver grooves
Head Studs – Case drilled & tapped for 1/2" head studs (*studs sold separately)
Pistons – IAG-Spec JE 86.1 mm FSR 2618 forged pistons, ring set, .210" x 2.250" chromoly wrist pins
Connecting Rods – IAG-Spec H-Beam rods with ARP2000 rod bolts
Rod / Main Bearings – OEM or King race bearings
Crankshaft – New Subaru FA20 crankshaft
Case / Main Bolts – Standard Subaru case bolts
Hardware – OEM oil plug (installed) at oil pan location

Compression Ratio:

12.5:1 (standard gasket thickness) :contentReference[oaicite:7]{index=7}

Power Rating:

Power: The IAG 800 Short Block has a power output rating of 800 BHP :contentReference[oaicite:8]{index=8}

Please Note: This item is not eligible for standard ground shipping and must be delivered via freight.
STOCK NOTICE: This item is built to order and carries a minimum 6-8 week build time.