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  1. Prc 15 degree heads and TD machine rocker arms

    LS1/LS2 Engine Tech
    I have a set of prc heads coming in this week. And I got a set of TD machine ls1,6 roller rockers. The prc description says factory rocker friendly. But TD machine is saying that the prc heads are completely different from factory. I’m thinking he could possibly be mistake for the 13 degree...