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For over 40 years; Cosworth's been leader in innovative multi valve cylinder head design both racing high performance production cars. Cosworth Ported Valve Cylinder head range is latest advancement. Modified from OE cylinder head castings; substantial flow improvements upgraded valve train components offer superior performance your high performance engine.
Each original cylinder head design is carefully evaluated tested to establish improvements required to meet target performance level. Hours of testing flow bench validation used to determine best advanced port design yielding maximum usable power response. However; there is more to cylinder head design than just maximum flow. It is critical that port velocits maintained to ensure drivability valve train components matched to guarantee reliable performance. Once of these factors have been tested validated; final port contour is digitized. Using digitized program; we then reshape both intake exhaust ports using axis mill producing an accurate consistent port shape every time. In addition to reshaping enlarging intake exhaust ports; most Valve Cylinder heads feature a re-shaped combustion chamber to un-shroud valves increasing flow performance. After machining; each cylinder head receives a multiangle high performance valve on precision valve seat cutter. Then each cylinder head is ultrasonically; cleaned; serialized then hand assembled with select high performance valve train components; ready to install on your engine.
Key Features
All OE Castings
Enlarged Intake Exhaust ports
Large diameter stainless steel intake valves
Large diameter Inconel exhaust valves
Hi Rev; Dual valve springs
Titanium Retainers
Hardened Steel spring platforms
Reshaped combustion chamber on most applications
Flow bench proven design
Dyno tested
Machined Cosworth Logo
Precision Multi angle valve job
Pre-assembled; ready to install
Machined port bore finish
Knife edge port divider Learn More

The Cosworth Subaru EJ25 CS600 series is designed extreme track use the demanding performance enthusiast. Each assembly is precision built by of Cosworths skilled craftsmen using finest components from parts catalog to ensure maximum reliable power performance. Starting with a Subaru EJ257 semi closed deck block; we meticulously hone each bore to guarantee perfect piston to cylinder wall clearance. block is then assembled with Forged Pistons; motorsport grade Forged H Beam connecting rods along with high performance and main bearings a STI Forged crankshaft. maximum performance; an optional steel billet crank is available (CS600X). Once cylinder block assembly is completed; we install a pair of CNC machine port-bored Valve Cylinder heads with proven S2 camshafts complete with valve lash to specifications. cylinder heads secured with high performance 11mm steel studs sealed with a Cosworth high performance stopper layer steel head gasket. Finally; we install of blue-printed; high pressure pumps maximum lubrication. This proven engine combination been used by teams to events in both North Americaand Europe.
Key Features
New Subaru EJ25 engine
New Subaru EJ25 Forged Crankshaft
Optional Billet Cosworth Crankshaft (CS600X)
Cosworth Forged H-beam Connecting Rods
Cosworth Forged Pistons rings
Cosworth motorsport Tri-metal bearings
Balanced to within gram
Complete blue-print assembly
Enlarged Intake 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 pump
Cam covers
Cosworth serial number Learn More

Cosworth High Performance engine assemblies the perfect basis your high performance application. Each version gone through countless hours of engineering evaluation to determine best combination of parts build specification; ensuring maximum reliable performance. Each Cosworth High Performance enginembly starts with new select components as foundation of performance build. Every block is thoroughly inspected before cylinders honed to perfection. We then balance rotating assembly that includes either a factory forged crankshaft or Cosworth Billet crank along with Cosworth Forged connecting rods; Cosworth Tri-Metal bearings Cosworth Forged Pistons. motorsport grade parts then professionally assembled by expert engine builders in Cosworth enginembly facility. Each High Performance enginembly includes a complete specification sheet listing critical dimensions along with a serialized plaque. maximum performance; combine with a Cosworth ported Valve Cylinder Head camshaft set.
Subaru EJ25 High Performance Short Block 2.5L
The Cosworth EJ25 is an excellent starting point high performance track applications.
New Subaru EJ25 EJ257 Block
New Subaru EJ25 Forged Crankshaft or Cosworth Billet Crank (79mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (99.5mm) rings
Cosworth Tri-metal bearings
Balanced to within .5 gram
Complete blue-print assembly
Ring set
Bearing clearance checked
Deck height checked
Connecting side clearance checked
Crankshaft float checked
Mitsubishi 4G63 (Evolution VII-IX) High Performance Short Block 2.0L
The Cosworth 2.0L 4G63 is an excellent starting point high performance track applications.
New Mitsubishi 4G63 Evolution Block
New Mitsubishi forged crankshaft (88mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (85mm) rings
Cosworth Tri-metal bearings
Cosworth Heavy Duty main studs
Piston squirt jets
Balanced to within .5 gram
Complete blue-print assembly
Ring set
Bearing clearance checked
Deck height checked
Connecting side clearance checked
Crankshaft float checked
Mitsubishi 4G63 (Evolution VII-IX) High Performance Short Block 2.2L
The Cosworth 4G63 2.2L stroker engine combines perfect bore to stroke ratio; yielding potentially gains in torque while still allowing engine to rotate produce power at higher rpms.
New Mitsubishi 4G63 Evolution Block
New Cosworth Billet Crank (94mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (86mm) rings
Cosworth Tri-metal bearings
Cosworth Heavy Duty main studs
Piston squirt jets
Balanced to within .5 gram
Complete blue-print assembly
Ring g Learn More

Cosworth High Performance engine assemblies the perfect basis your high performance application. Each version gone through countless hours of engineering evaluation to determine best combination of parts build specification; ensuring maximum reliable performance. Each Cosworth High Performance enginembly starts with new select components as foundation of performance build. Every block is thoroughly inspected before cylinders honed to perfection. We then balance rotating assembly that includes either a factory forged crankshaft or Cosworth Billet crank along with Cosworth Forged connecting rods; Cosworth Tri-Metal bearings Cosworth Forged Pistons. motorsport grade parts then professionally assembled by expert engine builders in Cosworth enginembly facility. Each High Performance enginembly includes a complete specification sheet listing critical dimensions along with a serialized plaque. maximum performance; combine with a Cosworth ported Valve Cylinder Head camshaft set.
Subaru EJ25 High Performance Short Block 2.5L
The Cosworth EJ25 is an excellent starting point high performance track applications.
New Subaru EJ25 EJ257 Block
New Subaru EJ25 Forged Crankshaft or Cosworth Billet Crank (79mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (99.5mm) rings
Cosworth Tri-metal bearings
Balanced to within .5 gram
Complete blue-print assembly
Ring set
Bearing clearance checked
Deck height checked
Connecting side clearance checked
Crankshaft float checked
Mitsubishi 4G63 (Evolution VII-IX) High Performance Short Block 2.0L
The Cosworth 2.0L 4G63 is an excellent starting point high performance track applications.
New Mitsubishi 4G63 Evolution Block
New Mitsubishi forged crankshaft (88mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (85mm) rings
Cosworth Tri-metal bearings
Cosworth Heavy Duty main studs
Piston squirt jets
Balanced to within .5 gram
Complete blue-print assembly
Ring set
Bearing clearance checked
Deck height checked
Connecting side clearance checked
Crankshaft float checked
Mitsubishi 4G63 (Evolution VII-IX) High Performance Short Block 2.2L
The Cosworth 4G63 2.2L stroker engine combines perfect bore to stroke ratio; yielding potentially gains in torque while still allowing engine to rotate produce power at higher rpms.
New Mitsubishi 4G63 Evolution Block
New Cosworth Billet Crank (94mm)
Cosworth Forged H-beam connecting rods
Cosworth Forged Pistons (86mm) rings
Cosworth Tri-metal bearings
Cosworth Heavy Duty main studs
Piston squirt jets
Balanced to within .5 gram
Complete blue-print assembly
Ring g Learn More

The piston is of most important components within engine. It be subjected to directional change up to times every second must withstand acceleration forces of 8500gs. Cosworth high performance forged pistons designed engineered to withstand this type of punishment still perform. Cosworth's pistons manufactured using same methods as Formula pistons include features such anti scuff skirt coating; ultra-strong pins; polished and patented antidetonation bands. Additionally; each application uses a unique forging to minimize weight ensure strongest possible piston design.
Key Features
Unique forgings each application
Xylan anti scuff skirt coating
Polished tops (reduces carbon build up relieves stress)
Manufactured from proprietary alloy (CosAl 010)
Ultra strong pin
Patented anti-detonation bands Learn More

Large diameter valves essential improved flow. Cosworth high performance intake valves produced from high quality stainless steel maximum durability. Exhaust valves machined from Inconel for
high temperature (2400 F) reliability. Each valve features swirl polished back improved flow dished face additional weight reduction. Cosworth high performance valves compatible with Cosworth Ultra
Race Valve Spring kits. Learn More

Large diameter valves essential improved flow. Cosworth high performance intake valves produced from high quality stainless steel maximum durability. Exhaust valves machined from Inconel for
high temperature (2400 F) reliability. Each valve features swirl polished back improved flow dished face additional weight reduction. Cosworth high performance valves compatible with Cosworth Ultra
Race Valve Spring kits. Learn More

Used mounting cam angle sensor to front of North American Spec cylinder heads. Useful adapting cylinder heads to Japanese European market engines. Learn More

The original sheet metal timing belt guide flex from belt deflection when subjected to extreme rpms causing timing belt to skip or more teeth on crankshaft sprocket. Cosworth Billet Timing Belt Guide developed to control this problem is machined from solid aluminium with a hard anodized finish. Includes mounting hardware. Learn More