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I might even run the motor without the valve covers on to see what it does. You definitely have a pressure problem in the crankcase. The new valve covers not having breathers or breather on one side may be the problem. How hard is it to change them. Not much. I say give it a try, it can't hurt. Other than that I cant think of why there would be positive crankcase pressure enough to blow oil out of the filler tube of all places. It also may look to you that this is the source of the leak. Clean the motor and watch where the leak is coming from. It may be it is the intake and just looks like the filler tube. Good luck in the sub zero weather.
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