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  1. 5.0L Talk
    Hi everyone, I just finished porting my GT40 heads. I have a CAM with about .550 lift from CompCams that I want to put in. They list two sets of springs that they reccomend both of which of have a much higher spring rate and seat pressure (117,132 lbs) than the stock springs. Should that be...
    gt40 valve springs isky
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