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I had really good luck with K/B hyperutectic's in a 391" sbc I built several years ago. But they like BIG ring gaps--Do not try to run them with the usual gap!! Follow the instructions. I ran them with .039 gaps.
The 391 had a Chinese $350 crank, the $200 pistons, a used roller cam, some old AFR 220 heads, Victor intake w/850 Holley--in a 2900lb(with me) it ran 10.25/131.
 

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If this is a 99% street car, and never see's past 7000rpm and rarely 6000rpm for that matter, and budget is an issue the speed-pro/federal-mogul/ ect. 345np or 345ncp hyperutectic piston is hard to beat at $75 a set. Tighter piston clearance can be used over a forged piston which can't hurt a motor that is expected to last for a long time. Right now the 345np can be bought for under $60 from some shops. Good Luck...
 
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