IAG Performance 1150 Destroked 2.35L Closed Deck EJ25 Short Block 2006-2014 WRX / 2004-2021 STI / 2004-2013 Forester XT / 2005-2009 Legacy GT

IAG Performance 1150 Destroked 2.35L Closed Deck EJ25 Short Block 2006-2014 WRX / 2004-2021 STI / 2004-2013 Forester XT / 2005-2009 Legacy GT

IAG's 1150 Series 2.35L destroked closed deck short block is an EJ25 rated to support up to 1150 BHP. It fits the 2006-2014 WRX, 2004-2021 STI, 2004-2013 Forester XT and 2005-2009 Legacy GT. The short-stroke billet crank allows a recommended limit of 9,000 RPM, aimed at track, road racing and competition drag use.

Build details

• Case halves: Brand new Subaru OEM 2.5L, machined for IAG Closed Deck Inserts that are pressed in and finished to a mirror surface
• Reinforcement: Case bolt reinforcement plugs
• Pinned mains: Machined for 9.5mm pins and line honed
• Head sealing: Fire-Lock receiver groove machining; machined for 14mm head studs
• Crankshaft: IAG-Spec billet 75mm
• Connecting rods: Custom IAG-Spec +2mm Tri-Beam forged with ARP 625+ rod bolts
• Pistons: JE 99.75mm FSR 2618 T6 custom, electroless nickel plated, thicker ringlands, .240" H13 tool steel wrist pins, JE Pro Seal ring set
• Bearings: ACL race rod and main bearings
• Assembly: Blueprinted, balanced and hand-assembled; ARP case bolts with sealant
• Why destroked: Lower piston speed, better rod-to-stroke ratio, longer dwell at top dead center

Before you order

IAG Fire-Lock .051" head gaskets with the IAG-Spec Alloy Ring Set are required. With those gaskets, compression is 9.2:1 on D heads (EJ255) and 8.8:1 on B, V and W EJ257 heads. Send us your VIN or engine code and we will confirm fitment before you order.

See also: Subaru oil pickup tube problems · FA20 vs EJ25 · head studs vs head bolts · EJ257 problems · is it worth replacing an engine? · Subaru head gasket problems and ringland failure · signs of a blown head gasket · Subaru WRX and STI parts · EJ255 vs EJ257 · subaru ej25 / ej257 · 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.