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Home » MAIN PARTS LISTING -- CLICK HERE » Cylinder Heads & Air Intake » Cylinder Heads & Valvetrain
Special Machining Features Include: CNC machined 46cc combustion chambers for consistent volume and shape. Precision mill bored valve guide bores provide fine surface finish for optimum heat transfer. Radii on head bolt spot faces to reduce stress risers that can lead to cracking. Thread milled spark plug ports assure consistent precision fit to plugs. Precision milled finish on all gasket surfaces. CNC contour machined multi angle valve seats provide superior geometry, roundness, and surface finish.
Key design features for the GN1 heads: Valves are moved closer to cylinder bore centerline to unshroud valves for more flow. Spark plugs are moved closer to cylinder bore center for improved combustion Special combustion chamber shape for maximum efficiency. Large 1.900" intake and 1.600" exhaust valves. High flow as cast intake and exhaust ports. Accepts stock rocker arms and stock valve covers. Lightweight compared to cast iron head.
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