Description:
Cosworth Big Valve Cylinder Head Subaru WRX STI 2.5L EJ25
Cosworth CNC ported cylinder heads feature dyno tested and flow bench proven ports, engineered for maximum usable power. Each new cylinder head is ported on a 5 axis machine to ensure consistency and perfect port shape every time. Additionally, larger intake (+1mm) and exhaust valves (+1mm) are utilized to help increase flow. Cosworth CNC ported Big Valve cylinder heads come complete with a performance valve job, hi rev (max 10,500rpm) valve springs with titanium retainers and are ready to install. Perfect for high performance applications.
Includes
CNC Ported - New Castings
Hand blended finish work
Intake – 14.63% (average) 22% (max) increased flow
Exhaust – 30.56%(average) 41% (max) increased flow
4-angle Inlet Valve job
3-angle & radius Exhaust Valve job
Valves are lapped
Back-Cut Inlet Valves
Heads are Ultra Sonic cleaned prior to assembly
Heads are Serialized and sport a machined Cosworth logo
+1mm Stainless Steel Intake Valves (1800 degrees max.)
+1mm Inconel Exhaust Valves (2400 degrees max.)
Performance Valve Springs
Titanium Retainers
Hardened Steel Spring Platforms
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