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  1. newboyracing

    Purple cam with low vac

    Are any of you guys running the 292/509 purple cam? I have a low vac pressure of just 4 psi. There are no leaks in the manifold & I went from a 6.5 power valve to a 4.5 and it seemed to help a lot with low speed street driveing. I am thinking about going to a 2.5 power valve to see if it gets...
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