I have seen similar issues with the Butler valley tray with the PVC provision fouling plugs. It is a sketchy design. You won’t necessarily find oil in the PVC line to indicate that is the problem, and it does not take very much oil in the line to make it a problem. Either add a PVC catch or like B man said, put a Tomahawk tray or stock tray on. Or plug the PVC and switch to vented valve covers. Sort that out before you get to deep into it.
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