I Just purchased a new DUI distributor gear for my 351W reverse rotation engine . It came undrilled on both sides. I have replaced many gears on Race Cars and they always have 1 side drilled so you can drill the other side when it is installed. I do have a drill press and a center punch, but marking it accurately would be tuff for me and the mock up would be the same. If its off I then would have to shim the distributor, all my cars have a slip collar. How has anyone else drilled the gear? Thank You Joe
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