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I've seen SC pistons chunk the edge of the piston off from detonation. Yous looks like it wore off rather than breaking off. The edges look smooth where the piston is missing. Or at least it appears that way. I wouldn't think and NA would detonate enough to chunk a piston. I guess pull it out and get a closer look.
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1987 GN PB 10.99 @ 121.00 GS Nats 1996
New build: CPT66BB/Forged Eagle crank/TRW forged pistons/Billet mains/XFI/65# Inj/9"Art Carr conv/Modded stock trans/Other crap I forgot 
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