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These factory plugs are tapered to allow oil flow around the tapered portion of the plug. Should a straight, non-tapered plug be installed in these galleys, oil flow would be greatly impeded or stopped completely.
Big-Block Shootout Part 3

 These factory plugs are tapered to allow oil flow around the tapered portion of the plug. Should a straight, non-tapered plug be installed in these galleys, oil flow would be greatly impeded or stopped completely.  View Related Article

 

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