Quote:
Originally Posted by livelovesole
Thank you so much for the great info guys. I just happened to run into a P12 head first so I jumped on it. Brndck: I planned in running the mazworx intake plenum And E85. I was thinking that it would of been better insurance to upgrade the valvetrain but wasn't too sure yet. Ralliart: do you think keeping the 5.5mm intake valves is best then?
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The stem of the valve isn't the concern with the P12 heads, it's the neck of the valve(4.5mm) which can stretch with the added heat of a turbocharged engine.
Inconel or SS valves are the best when it comes to heat management. Sodium filed play a role in longevity, typically used in OEM applications but do have a limit to heat tolerance, usually 1600*F.