those particular heads seem almost too big for the application...id also recommend a bigger cam. either more lift or more duration, beings your going for HP id say stick with a lift in that area but you need more duration. i know guys with a similar combo, with 64cc AFRs and the LT4 hotcam with stealth ram that get right around 400+ at the crank.
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87 iroc with the usual go fast stuff
heavier than your half ton.
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