602 vs. 8.5;1 motors

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  • grayarea58
    Junior Member
    • Jan 2009
    • 14

    #1

    602 vs. 8.5;1 motors

    our track is allowing the 602 vs our 8.5 to 1 built motors. but we have to run stock exhaust manifolds per rules. an idea of how much power lose it will have . no rule on pipe size, any muffler.
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