New Product Information: Cylinder Head for all air cooled 911 964 993 engine’s Head is offered in both full finished state or to customer specification part finished, this is enabling the engine builder / to tailor make his heads to suit his engine application with respect to valve sizes including stem diameter, port sizes both intake and exhaust, port manifold flange fixings i.e. intake two or three bolt fixing exhaust port left or right hand fixing holes. Heads can be supplied with 8.00mm hollow stem valves with up to 53.00mm intake

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