That's actually a lot that you took off and will cause the piston to slap around. Are you sure about the measurement? The Probe pistons I run in the Cobra call for a clearance of .003 - .007. I had Dick finish hone the block for .005 because I'm not running an intercooler. That's what I had on with the 302 as well and it didn't have piston slap nor did it scuff the piston skirts even with how hard I ran it.
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