Staged Blocks

IAG Stage 1 Short Block The IAG Stage 1 Short Block is perfect for lightly modified EJ25 Subaru's that need a basic and reliable performance short block. Subaru turbo engines are commonly known for piston ring land failures and if gone unchecked lead to...

IAG Stage 2 Short Block The IAG Stage 2 Short Block is designed for modified EJ25 Subaru's that need a beefed-up performance short block. The IAG Stage 2 short block builds off the Stage 1's strengths by adding IAG Spec H-Beam forged connecting rods. The...

IAG Stage 2 Tuff Short Block The IAG Stage 2 Tuff short block starts with new Subaru 2.5L EJ25 engine case halves that are bored and honed to 99.75 on our in-house Sunnen SV-30 the most advanced automotive cylinder hone available. IAG's in-house honing...

IAG Stage 2.5 Subaru EJ25 Closed Deck Short Block The IAG Stage 2.5 Short Block starts with brand new Subaru 2.5L engine case halves. IAG machines the case halves assembled together in our Haas VF-4SS CNC mill to accept the IAG CLOSED Deck Inserts that...

IAG Trojan Subaru EJ25 Closed Deck Short Block The IAG Trojan Short Block starts with brand new Subaru 2.5L engine case halves. IAG machines the case halves assembled together in our Haas VF-4SS CNC mill to accept the IAG CLOSED Deck Inserts that...

IAG Magnum Subaru EJ25 Closed Deck Short Block The IAG Magnum Short Block starts with brand new Subaru 2.5L engine case halves. IAG machines the case halves assembled together in our Haas VF-4SS CNC mill to accept the IAG CLOSED Deck Inserts that...

IAG Stage 3 Extreme Subaru EJ25 Closed Deck Short BlockThe IAG Stage 3 Extreme Short Block starts with brand new Subaru 2.5L engine case halves. IAG machines the case halves assembled together in our Haas VF-4SS CNC mill to accept the IAG CLOSED Deck...

IAG Stage 4 Tuff Subaru EJ25 Closed Deck Short Block The IAG Stage 4 Tuff Short Block starts with brand new Subaru 2.5L engine case halves. IAG machines the case halves assembled together in our Haas VF-4SS CNC mill to accept the IAG CLOSED Deck Inserts...

IAG Stage 4 Extreme Closed Deck EJ25 Subaru Short BlockThe IAG Stage 4 Extreme Short Block starts with brand new Subaru 2.5L EJ25 engine case halves. The case halves are split and the main webs are CNC machined in our Haas VF-4SS CNC mill for 9.5mm pins...

IAG / Willall Stage X Billet Aluminum EJ25 Subaru Short Block Using the same world-leading technology found in Willall's incredible billet GT-R block, the billet EJ case seeks to change the Subaru performance tuning market by reinventing the EJ and...

The Subaru OEM 2.5L 2004-2020 STI Short Block comes assembled with new pistons, rods, bearings and crankshaft. The engine can be used as a replacement short block for 2.5L turbo WRX, Forester XT and Legacy GT models as well as an upgrade for 2.0L EJ20...