I know that '82 to '85 HO 302 were identical in terms of production except for exhaust/induction and i'm pretty sure that stock they have valve reliefs. '86 was the first year for the roller cam engine and it had the old style heads before they changed to the E7TE heads and flat top pistons for some reason. I'm almost sure that they're the only HO engine built with flat tops. I may be wrong though, but i'm pretty sure.
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