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Originally Posted by FORSFED
220 isn't too hot, many gm cars I know of run 210 - 220 from the factory as well as my girlfriends blazer that stays at 220 all day long.
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on cast iron heads
220* on a aluminum head is just asking for a warping. NOT saying it will, but its not good. Ive gone up to 240 before and I thought it was all over for my poor ported head, thank god it wasnt.
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