My experience with piston slap, -I sold a low mile 305 from a 77 Nova because it scared me. That buyer ran the crap out of it in a 69 3/4 gmc and it never failed. I found later that that year commonly had piston slap. I had a rebuilt chev 350 that I put 60-70 K on before selling to someone who put it straight in a car. I have a 189 K LT1 thats slapping away and runs like a striped @$$ ape. I have a 40K Cad 500 (in 86 chev pu)that started slapping around 5-10 K. It's getting a tad louder but still fades and is gone above 1200 rpm and warmed up. That engine works really hard pulling a car trailer and putting up with my having fun. It is disappointing I know, -I used to worry alot. But I haven't personally heard of a failure from it. Just my experience and 2 cents.
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