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Crazy as this may sound, try running a tap in each bolt hole. I had a valve cover leak that would not go away. Pulled the stock steel cover, checked the gasket, looked for any interference or gunk on the seating surface, etc. The only thing I had changed was installing a set of MP chrome valve...

Puts a small degree of side angle on the driveshaft ujoints. Ujoints don't do well running in a straight line. Harmonics come into play.