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I've heard of people having float issues with the PAC 660s and even some outright breaking within 5k miles.
My shop won't use them. They tell customers to bring in BTRs or comp cams
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'18 1SS 1LE M6 NGM|| 11.5:1 Diamond Pistons || Callie's H-beams || Vengeance III Cam Kit || Built Heads || TSP LTs 1 7/8"(C-Coated) || MSD IM || DSX E85 || Rotofab || BMR Springs || 576/472 @7000rpm
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