Cosworth Evolution VIII 4G63 Replacement Ported Cylinder Head
[COS KK3672]
 Our Price: $4,223.00
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Description:Cosworth Evolution VIII 4G63 Replacement Ported Cylinder Head
[COS KK3672]
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
  • +1mm Stainless Steel Intake Valves (1800 degrees max.)
  • +1mm Inconel Exhaust Valves (2400 degrees max.)
  • Performance Valve Springs
  • Titanium Retainers
  • Hardened Steel Spring Platforms
  • Reshaped combustion chamber

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