I don't have anything to use really,thats the only set of heads I've ever bought, they replaced factory heads and it was my mistake not to have them looked at first.
ohh well.. aside from the one plug everything else is going mint! I've never been happier with how it ran or drove before than I am now
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5.3L LSx, Fbody .500 cam, TH400, 4500 Stall, Moser 9"
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