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Mine does it when the engine is cold. More pronounced in the cooler weather here in TX now. It only does it above 2500 RPM until the temp gauge moves off the cold peg. It was non-existent in July, Aug., and Sept. with 90-100 degree daily temps.

I talked to a Hi-perf engine builder who said this is typical of short skirt pistons in a cold engine. They usually see it in extreme strokers when they use short skirted pistons to keep the bottom ends of them inside the cylinders.
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