Piston to valve, head clearance

[ChuckZZ]

What is recommended? Stock animal crank, model 15 block, only going to turn it around 8300. Thanks for the input.

 

[CarlsonMotorsports]

As long as you have good valve springs, .050" will be plenty. I've run them at .035" with no problem in the past, but it makes me nervous. When things heat up and that rod/piston stretches, I'd rather err on the safe side.


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Brian Carlson
Carlson Racing Engines
Vector Cutz
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[ChuckZZ]

Thank you for your response. That applies to both head and valves?

 

[CarlsonMotorsports]

Pretty much, yes.
It depends on the combustion chamber shape, piston dome, and CCs, but .035" quench (clearance) is safe for most applications.