Re: Newby Overhauling a 283
Piston slap is usually caused by excessive clearance in the bore or possibly a collapsing piston skirt. You can try to narrow it down by running the engine and disconnecting one plug at a time and see if the knock goes away,the cyl that silences the noise some is most likely your bad piston or rod or main bearing. If the noise is still there after that test it could be something else in the power train making noise,good luck.
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