IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block

The IAG Performance Stage 2.5 International Hybrid EJ25 Subaru Closed Deck Short Block is a performance engine component designed to increase displacement and low-end torque. It is intended for vehicles originally equipped with the EJ20 2.0L engine. This short block features custom pistons designed to lower compression and match EJ20 cylinder heads without modifications.

The block is converted to a closed deck configuration using new Subaru 2.5L engine case halves. It is then precision bored and honed to 99.75mm, with custom piston-to-wall clearances. The assembly includes a 2017+ Subaru 2.5L nitride-treated STI crankshaft, IAG-Spec Tuff H-Beam connecting rods with ARP2000 bolts, and ACL or King Race bearings.