Piston Slap...
#41
TECH Enthusiast
Join Date: Dec 2005
Location: NW burbs of Chicago
Posts: 510
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The best example of this that happen to me: a small exhaust leak long after a header install. It was ever so subtle of a tick. Ten people in a row swore it was rocker, valve, lifter, piston rod, you name it. once found it was an easy fix and blissful silence.