On one of my Clevelands I was running the TRW forged pop-up piston. It require a minimun of .0055" clearance. Since it was a Boss with solid lifters I never noticed anything except when it was really cold, like 0. Then it would rock like a diesel, but what engine wouldn't?
I have KB hypertutonic in my 347. Those pistons as I recall are set at .0015 and those you hear at cold start up, yup.
It's ok since they fit into the expected character of a high-performance engine. Makes the little Hondas think a little.
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