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Cosworth stroker kits the perfect to displacement; torque power to your engine. Each includes select matched components from parts list ensuring reliable performance.
Mitsubishi 4B11 (Evolution X) 2.2L
Cosworth Forged Pistons (86mm)
Cosworth Fully Counterweighted Billet Crankshaft (94mm)
Cosworth Forged Connecting Rods
Cosworth'ston Rings
Mitsubishi 4G63 (Evolution VII-IX) 2.2L
Cosworth Forged Pistons (86mm)
Cosworth Fully Counterweighted Billet Crankshaft
(94mm)
Forged Cosworth Connecting Rods
Cosworth and Main Bearings
Cosworth'ston Rings
Subaru EJ25 2.6L
Cosworth Forged Pistons (99.5mm)
Cosworth Fully Counterweighted Billet Crankshaft
(81mm)
Forged Cosworth Connecting Rods
Cosworth and Main Bearings
Cosworth'ston Rings Learn More

COMPETITION CLUTCH
Stage 4 Sprung - Strip Series 1620 Clutch Kit

This assembly; available with a double spring; six rivet carriage is good for ease of gear transition with higher horsepower. This disc complimented by a performance pressure plate provides up to 250% increase in torque capacity. 300 mile break-in recommended with this set-up.

The 1620 Series kit includes a performance pressure plate; a six puck high torque sprung disc with Ceramic buttons; all applicable bearings; and the appropriate alignment tool.

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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

For: Subaru WRX Sti YR: 2004-2011 Cyl: 4 App: 2.5L Turbo 6-SHPeed
The versatile FX500 System uses either the Power Plus I or Power Plus II Pressure Plate along with a solid center 4,6 or 8 wing (paddle) Ceramic Button disc. The FX500 disc is designed for outstanding holding capacity and rapid heat dissipation. The FX500 ceramic paddle design creates a quick and rapid engagement as well as clutch chatter that is not recommended for the street. Learn More

For: Subaru Impreza RS YR: 1995-1995 Cyl: 4 App: 1.8L 2WD
The FX200 System uses the Power Plus I Pressure Plate and a Steel Backed Kevlar disc. This clutch is designed for the street enthusiast or weekend racer. The FX200 offers similar torque rating and holding capacity as the FX100, however, its life expectancy is increased with the Kevlar disc. Our Kevlar friction material is non-abrasive and doesn't score the mating surfaces. It features only slightly increased pedal pressure, significantly longer life than stock, and normal clutch feel during engagement and disengagement for the smoothest operation of any stage we offer. Minimum 500 Required break in miles. Please see The Technical guide for more details Learn More

Complete Set of Pistons
Bore : 86mm
C/D : 33.35mm
Comp Ratio : 9.0:1
Dome CC : -5
Gram Weight : 336
Head CC : 50.5
Oversized : STD mm
Rod : 143.76mm
Skirt Type : Full Round
Stroke : 86mm

JE Pistons
For Turbo and Nitrous Aps
Set of 4 Pistons
Recommended RingSet: JG1004-3386
Engine :-
Aspiration :- T
Vehicle Engine Options :- ALL
Vehicle Interior Options :- L4 Aspiration: T
Vehicle Exterior Options :- Fuel: FI-GAS
Cylinder Type :-
Vehicle Options :- Bore86mm - C/D33.35mm - Comp Ratio9.0:1 - Dome CC-
JE Pistons are specifically engineered for extreme applications up to. and including. professional competition. In this environment. higher compression ratios. extreme boost levels and heavy nitrous usage necessitate the higher tensile strength 2618 aluminum alloy found in every JE Piston.
*Application Specific Forgings for an Optimized. Uniform Crown Thickness
*Contact Reduction Groove to Minimize Frictional Drag
*Accumulator Groove for Increased Top Ring Stability and Sealing
*CNC-Machined Side Relief with Lower Support Band for Additional Skirt Strength
*Honed Pin Bores. Double Pressure Fed Pin Oilers and Wire Locks Included
*JE ProSeal Piston Rings are included with your JE Pistons
JE Pistons are sold as matched sets.
*Custom Applications are also Available 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