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Re: Piston to valve Clearance?
I've never actually measured any of that. These are interference engines so if you have valve float then no matter the tolerance, you will run the risk of valves touching pistons. You shouldn't be seeing valve float at 6500rpms though, unless you have some insanely old wore out springs, and/or some very aggressive cams.
Unless both the block and head have been milled several times, or you're running some sort of unique or crazy setup, I guess I wouldn't be overly concerned because it is what it is.
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