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Cosworth Performance Racing Parts

Cosworth Performance Racing Short Blocks

cosworth block

Cosworth High Performance Engine assemblies are the perfect basis for your high performance application. Each Cosworth Short block has gone through countless hours of engineering and evaluation to determine the best combination of parts and build specification, ensuring maximum reliable performance. Each Cosworth High Performance Engine assembly starts with all new select components as the foundation of the performance build. Every block is thoroughly inspected before the cylinders are honed to perfection. Cosworth then balances the rotating assembly that includes either a new factory forged crankshaft or Cosworth Billet crank along with Cosworth Forged connecting rods, Cosworth Tri-Metal bearings and Cosworth Forged Pistons. The motorsport grade parts are then professionally assembled by expert engine builders in the Cosworth engine assembly facility. Each High Performance Engine Assembly includes a complete specification sheet liSTing all critical dimensions along with a serialized plaque. For maximum performance, combine with a Cosworth CNC ported Big Valve Cylinder Head and camshaft set.

Cosworth Performance Short Block Features:
  • New Cosworth Block
  • New Cosworth forged crankshaft
  • Cosworth Forged H-beam connecting rods
  • Cosworth Forged Pistons and rings
  • Cosworth Tri-metal bearings
  • Cosworth Heavy Duty mainstuds
  • Piston squirt jets
  • Balanced to within .5 gram
  • Complete blue-print assembly
  • Ring gap set
  • Bearing clearance checked
  • Deck height checked
  • Connecting Rod side clearance checked
  • Crankshaft end float checked

High Performance Short Block Assemblies
Subaru
SB8005Subaru STi EJ25 Short Block (2.5L)-Forged Pistons, Rods 8:2:1 cr
SB8007Subaru STi EJ25 Short Block(2.5L)-Forged Pistons, Rods W 79mm Billet Crank 8:2:1 cr
20003486Subaru STi EJ25 Short Block(2.5L)-Forged Pistons, Rods W 81mm Billet Crank 8:2:1 cr
20007702Subaru STi EJ25 Short Block OE Crank 9.2:1 cr (High compression ratio)
20007697Subaru STi EJ25 Short Block 81mm Crank 9.2:1 cr (High compression ratio)
20007703Subaru STi EJ25 Short Block 79mm BLT Crank 9.2:1 cr (High compression ratio)
Nissan
20000067Nissan VQ35 Short Block (3.5L) Lo comp 8.8:1
CI8019Nissan VQ35 Short Block (3.5L) Hi comp 11:1
KK3879Nissan VQ35 Short Block (3.5L) Hi comp 11:1
Mitsubishi
CI8015Mitsubishi Evo VIII/IX 4G63 Short Block (2.0L)-Forged Pistons, Rods
CI8018Mitsubishi Evo VII/IX 4G63 Short Block (2.2L)-Forged Pistons, Rods, Billet Crank
20014144Mitsubishi Evo X 4B11T Short Block (2.2L)-Forged Pistons, Rods, Billet Crank

Cosworth Performance Racing Long Block

cosworth block

After several years of teSTing and development, the Cosworth CS600 series High Performance Subaru EJ25 long block has arrived. The CS600 series is designed for extreme track day use and the demanding performance enthusiast. Each assembly is precision built by one of Cosworths 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 multi layer steel head gaskets. 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 America and Europe and is available now for general sale.

Cosworth Racing Long Block Features:
  • New Subaru EJ25 STi Engine case
  • Cosworth Billet Crankshaft 79mm
  • Cosworth Forged H-beam Connecting Rods
  • Cosworth Forged Pistons 99.5mm (8.2:1)
  • Cosworth motorsport Tri-metal bearings Balanced to within .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
  • Valve lash set
  • Cosworth high pressure oil
  • Cam covers
  • Cosworth serial number

High Performance Long Block Assemblies
Subaru North American spec EJ25 CS600 & CS600X
20000162Subaru EJ25 (2.5L) 2004-06 Big Valve Cylinder heads and KK3766 Camshafts-79mm Billet Crankshaft 8:2:1 cr
20000161Subaru EJ25 (2.5L) 2004-06 Big Valve Cylinder heads and KK3766 Camshafts-STD Crankshaft 8:2:1 cr
20002503Subaru EJ25 (2.5L) 2007 Big Valve Cylinder heads and KK3766 Camshafts-79mm Billet Crankshaft 8:2:1 cr
20002504Subaru EJ25 (2.5L) 2007 Big Valve Cylinder heads and KK3766 Camshafts-STD Crankshaft 8:2:1 cr
High compression ratio
20007705Subaru EJ25 (2.5L) 2004-06 Big Valve Cylinder heads and KK3766 Camshafts - STD Crankshaft 9.2:1 cr
20007706Subaru EJ25 (2.5L) 2007 Big Valve Cylinder heads and KK3766 Camshafts - STD Crankshaft 9.2:1 cr
20007709Subaru EJ25 (2.5L) 2004-06 Big Valve Cylinder heads and KK3766 Camshafts - 79mm Billet Crankshaft 9.2:1 cr
20007710Subaru EJ25 (2.5L) 2007 Big Valve Cylinder heads and KK3766 Camshafts -79mm Billet Crankshaft 9.2:1 cr
Subaru North American spec EJ25 CS600 & CS600X 81mm Stroke
20003488Subaru EJ25 (2.5L) 2004-06 Big Valve Cylinder heads and KK3766 Camshafts- 81mm Billet Crankshaft 8:2:1 cr
20003489Subaru EJ25 (2.5L) 2007 wBig Valve Cylinder heads and KK3766 Camshafts- 81mm Billet Crankshaft 8:2:1 cr
High compression ratio
20007711Subaru EJ25 (2.5L) 2004-06 Big Valve Cylinder heads and KK3766 Camshafts - 81mm Billet Crankshaft 9.2:1 cr
20007712Subaru EJ25 (2.5L) 2007 Big Valve Cylinder heads and KK3766 Camshafts - 81mm Billet Crankshaft 9.2:1 cr
Subaru European/Asia spec EJ25 CS600 & CS600X
20000160Subaru EJ25 (2.5L) 2004-06 Big Valve Cylinder heads and KK3920 Camshafts-79mm Billet Crankshaft 8:2:1 cr
SB8008Subaru EJ25 (2.5L) 2004-06 Big Valve Cylinder heads and KK3920 Camshafts-STD Crankshaft 8:2:1 cr
20002503Subaru EJ25 (2.5L) 2007 Big Valve Cylinder heads and KK3766 Camshafts-79mm Billet Crankshaft 8:2:1 cr
20002504Subaru EJ25 (2.5L) 2007 Big Valve Cylinder heads and KK3766 Camshafts-STD Crankshaft 8:2:1 cr
High compression ratio
20007708Subaru EJ25 (2.5) 2004-06 Big Valve Cylinder heads and KK3920 Camshafts - 79mm Billet Crankshaft 9.2:1 cr
20007707Subaru EJ25 (2.5) 2004-06 Big Valve Cylinder heads and KK3920 Camshafts - STD Crankshaft 9.2:1 cr
Subaru European/Asia spec EJ25 CS600 & CS600X 81mm Stroke
20003490Subaru EJ25 (2.5L) 2004-06 Big Valve Cylinder heads and KK3920 Camshafts- 81mm Billet Crankshaft 8:2:1 cr
20003489Subaru EJ25 (2.5L) 2007 Big Valve Cylinder heads and KK3766 Camshafts- 81mm Billet Crankshaft 8:2:1 cr
High compression ratio
20007713Subaru EJ25 (2.5L) 2004-06 Big Valve Cylinder Heads and KK3920 Camshafts - 81mm Billet Crankshaft 9.2:1
20007712Subaru EJ25 (2.5L) 2007 Big Valve Cylinder heads and KK3766 Camshafts - 81mm Billet Crankshaft 9.2:1 cr
Subaru CS600 MAX (Includes H11 head studs and High volume oil pump, 81mm crankshaft )
20007211Subaru EJ25 (2.6L) 2004-06 Big Vlv Cyl Head, KK3920 Cams, 81mm billet crank, H11 head studs, 12mm oil pump, 8.2:1 cr
20007212Subaru EJ25 (2.6L) 2004-06 Big Vlv Cyl Head, KK3766 Cams, 81mm billet crank, H11 head studs, 12mm oil pump, 8.2:1 cr
20007213Subaru EJ25 (2.6L) 2007 Big Vlv Cyl Head, KK3766 Cams, 81mm billet crank, H11 head studs, 12mm oil pump, 8.2:1 cr
High compression ratio
20007714Subaru EJ25 (2.6L) 2004-06 Big Vlv Cyl Heads KK3920 Cams - 81mm Billet Crankshaft H11 head studs, 12mm oil pump, 9.2:1 cr
20007715Subaru EJ25 (2.6L) 2004-06 Big Vlv Cyl heads KK3766 Cams - 81mm Billet Crankshaft H11 head studs, 12mm oil pump, 9.2:1 cr
20007716Subaru EJ25 (2.6L) 2007 Big Vlv Cyl heads KK3766 Cams - 81mm Billet Crankshaft H11 head studs, 12mm oil pump, 9.2:1 cr
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