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Cosworth Short Block EJ25 79mm Forged Crank 9.2:1 CR 2004-16 Subaru STI, 2006-2014 WRX

If you have taken the mod path beyond the limits of what a stock engine can handle, then it may be time to upgrade to an engine built with an engine block that is a result of countless hours of research and dyno evaluation. 

Our superior EJ25 short block contains premium components to sustain large amounts of power and boost. Each short block begins with a brand new Subaru case. The case is thoroughly inspected just before the cylinders are bored out appropriately to receive a set of our incredible Forged Pistons. 

From this point, everything is balance in the rotating assembly which includes a new Subaru forged crankshaft along with a set of forged H-beam connecting rods. A set of tri-metal race spec bearings are employed to the rods, while one of our skilled engine building experts finishes the assembly. 

This particular block will have a 9.2:1 compression ratio. 

  • New Subaru EJ25 STI Engine Case
  • Subaru Forged 79MM Crankshaft
  • Cosworth Forged H-beam Connecting Rods
  • Cosworth Forged Pistons and Rings
  • Cosworth Coated Tri-Metal Bearings
  • Balanced within .5 Gram
  • Ring Gaps checked
  • Deck Height checked
  • Connecting rod side clearance checked
  • Crankshaft end float checked
  • 99.5mm Bore
  • 9.2:1 CR
  • 2.5L Displacement

Replacement Components: 
  • COS1 10001436, Replacement Piston Kit
  • COS1 20001515, Single Piston
  • COS1 20001517, Replacement Rings
  • COS1 PP5433, Wrist Pin Clip
  • COS1 PA2674, Wrist Pin
  • COS2 20015303, Replacement Rod
  • COS2 20002587, Rod Set

*Oil pump not included

Cosworth EJ25 Short Block For 2004-16 Subaru STI, 2006-14 WRX (9.2:1 CR / 79mm C

SKU: 20007702
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