Cosworth EVO 4G63 MIVEC CNC ported Big Valve Cylinder Head
Cosworth CNC ported cylinder heads feature dyno tested and flow bench
proven ports, engineered for maximum real world 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 big turbo applications. A flow chart
for the modified head is available by downloading the technical
document on the left.
Specification
CNC Ported/machine finished port - New OE Castings
Hand blended finish work
Intake – 26% Increased Flow (max)
Exhaust – 18% Increased Flow (max)
4-angle Inlet Valve job
3-angle & radiused 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
