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Cosworth Long Block Assembly; CS600 Max; 2.6L Stroker; Big Valve Cylinder Head; KK3766 Camshafts; 81mm Billet Crankshaft; H11 Head Studs; 12mm Oil Pump SUBARU FORESTER

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Part #: 20007716
Notes: Long Block Assembly
CS600 Max
2.6L Stroker
Big Valve Cylinder Head
KK3766 Camshafts
81mm Billet Crankshaft
H11 Head Studs
12mm Oil Pump
Your Price: $19,254.80
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Comp Ratio 9.2:1

All Fitments

Year Model SubModel Cylinders Liter Aspiration Eng Desg. Fuel Notes
2007 - 2007 FORESTER XT LIMITED H4 2.5 T EJ255 ALL
2007 - 2007 IMPREZA WRX
H4 2.5 T EJ255 ALL
2007 - 2007 LEGACY GT LIMITED H4 2.5 T EJ255 ALL
2007 - 2007 OUTBACK XT LIMITED H4 2.5 T EJ255 ALL

Product Description

The Cosworth Subaru EJ25 CS600 series is designed for extreme track day use and the demanding performance enthusiast. Each assembly is precision built by one of Cosworth’s skilled craftsmen using the finest components from our parts catalog to ensure maximum reliable power and performance. Starting with a new Subaru EJ257 semi closed deck block, we meticulously hone each bore to guarantee perfect piston to cylinder wall clearance. The block is then assembled with our Forged Pistons, motorsport grade Forged H Beam connecting rods along with our high performance rod and main bearings and a new STI Forged crankshaft. For maximum performance, an optional steel billet crank is available (CS600X). Once the cylinder block assembly is completed, we install a pair of our CNC machine port-bored Big Valve Cylinder heads with our proven “S2” camshafts complete with valve lash set to our specifications. The cylinder heads are secured with our high performance 11mm steel studs and sealed with a Cosworth high performance stopper layer steel head gasket. Finally, we install one of our blue-printed, high pressure oil pumps for maximum lubrication. This proven engine combination has been used by top teams to win events in both North Americaand Europe.

Key Features

  • New Subaru EJ25 STI Engine case
  • New Subaru EJ25 STI Forged Crankshaft
  • Optional Billet Cosworth Crankshaft (CS600X)
  • Cosworth Forged H-beam Connecting Rods
  • Cosworth Forged Pistons and rings
  • Cosworth motorsport Tri-metal bearings
  • Balanced to within 0.5 gram
  • Complete blue-print assembly
  • Enlarged Intake and Exhaust ports
  • Large diameter stainless steel intake valves
  • Large diameter Inconel exhaust valves
  • Hi Rev, Dual valve springs
  • Titanium Retainers
  • Hardened Steel spring platforms.
  • Multi angle valve job
  • CNC Machined port finish
  • Knife edge port divider
  • Cosworth S2 High lift camshafts
  • Valve lash set
  • Cosworth high pressure oil pump
  • Cam covers
  • Cosworth serial number

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