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My thoughts:
Cams spin at half engine speed so 720/6=120 so it would be in the timing not the crank/pistons.
Piston valve relief too small? Valves touching each other?
But I'm not really the right one to ask. I've got no experience.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
Last edited by Flieger; 02-14-2016 at 05:01 PM..
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