has gone through countless hours of dyno evaluation to determine the best combination of parts to guarantee maximum reliable performance. 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 Cosworth’s 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.
New Subaru EJ25 STI Engine Case
New Subaru STI Forged Crankshaft
Cosworth Forged Connecting Rods
Cosworth Forged Pistons
Cosworth High Performance Piston Rings
Cosworth Race Spec coated Tri- Metal Bearings Balanced and Professionally assembled
Billet Crankshaft optional
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 Cosworth’s 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.New Subaru EJ25 STI Engine Case
New Subaru STI Forged Crankshaft
Cosworth Forged Connecting Rods
Cosworth Forged Pistons
Cosworth High Performance Piston Rings
Cosworth Race Spec coated Tri- Metal Bearings Balanced and Professionally assembled
Billet Crankshaft optional
HIGH FLOW OIL PUMP
Increasing oil volume will help to prevent bearing damage and 
engine failure. Additionally, sustained High RPM use may cause oil starvation at the rod and main bearings The Cosworth High Volume Subaru EJ20/EJ25 series oil pump utilizes a completely new inner and outer 12mm rotor to increase volume by 20%. Suggested applications include drag, track day and race use. Each kit includes all required mounting hardware and sealsSpecifications:
Larger 12mm gears increase volume by 20%
Essential for sustained high rpm applications
Installation kit included
engine failure. Additionally, sustained High RPM use may cause oil starvation at the rod and main bearings The Cosworth High Volume Subaru EJ20/EJ25 series oil pump utilizes a completely new inner and outer 12mm rotor to increase volume by 20%. Suggested applications include drag, track day and race use. Each kit includes all required mounting hardware and sealsSpecifications:Larger 12mm gears increase volume by 20%
Essential for sustained high rpm applications
Installation kit included
Subaru WRX STI EJ25 (2.5L)
Main Bearing & Con Rod Set STD - Tri Metal
Engine bearings are one of the most vital components within an engine and are often overlooked when considering high performance upgrades. Performance engineered, multi-layer bearings generate less heat than normal bearings by reducing friction. Cosworth Race 
bearing sets feature a unique combination of design, metallurgy and engineering to deliver what drivers expect from high performance Trimetal engine bearings. Engineered with the following features: •High strength overlay plate with reduced thickness for better oil control and less friction •Hardened steel backing on all connecting rod bearings •Increased crush and elimination of flash plating •3/4 grooving on Main Bearings providing optimum oil supply •Tight consistent wall tolerances •Oversize chamfers where applicable •Tested to over 1000 horsepower!
bearing sets feature a unique combination of design, metallurgy and engineering to deliver what drivers expect from high performance Trimetal engine bearings. Engineered with the following features: •High strength overlay plate with reduced thickness for better oil control and less friction •Hardened steel backing on all connecting rod bearings •Increased crush and elimination of flash plating •3/4 grooving on Main Bearings providing optimum oil supply •Tight consistent wall tolerances •Oversize chamfers where applicable •Tested to over 1000 horsepower!
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