I would lean more towards a pin got sloppy than slap. The noise is diff than slap, pretty familiar with the sound slap makes.
I know on my Olds engine, a couple pins were big (clearance), machine shop let it go and said it would be fine, and I assembled it against better judgement. It could probably go 100k miles like that, but just drives me nuts. Think the spec was .0005-7, and the couple in question ended up in the .0012 range, but that's straight from memory.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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