Cosworth High Performance Short Block Assembly Forged Pistons, Rods W 79mm Billet Crank Subaru STI EJ25 2.5L
Cosworth EJ25 (STI) short block has gone through countless hours of dyno evaluation to determine the best combination of parts to guarantee performance and reliability. Each EJ25 short block starts with a brand new Subaru case. The case is inspected and then the bores are honed to perfection to receive Cosworth Forged Pistons. We then balance the rotating assembly that includes a new STI Forged crank and Cosworth Forged H-Beam Connecting Rods to within .5 gram. The select parts are professionally assembled by one of Cosworths skilled engine builders using our own coated , tri metal race spec bearings. Options include: Billet 79mm crankshaft, Billet timing belt guide. For added performance, please see our Cosworth CNC ported Big Valve Cylinder Heads and high performance camshafts.
- Cosworth EJ25 short block includes the following:
- New Subaru EJ25 STI Engine case
- Cosworth Billet Steel 79mm Crankshaft
- Cosworth Forged H-beam Connecting Rods
- Cosworth Forged Pistons and rings
- Cosworth Coated, Tri-metal bearings
- Balanced to within .5 gram
- Complete blue-print assembly
- Ring gap checked
- Bearing clearance checked
- Deck height checked
- Connecting Rod side clearance checked
- Crankshaft end float checked
About Manufacturer: Cosworth
Over the last 50 years Cosworth have developed an in-depth knowledge of engines, electronics and a range of high performance technologies. This has been used to supply some of the most successful motor sport teams and vehicle manufacturers in history.
Our unprecedented success has fueled customer demand globally from diverse market sectors designing and developing technologies and components for aerospace, automotive, defense and sport applications.