got blowby?

Are these the little canister breathers with the stem for a hose or the open drum air filter looking ones. Sounds like there is positive pressure inside the crankcase. You can resolve this by plugging those stupid things and putting a single drum air filter type breather at the top of the filler neck. Mine shot oil out of the pcv fitting until I switched to an open breather element high out of the oil's reach. Those valve covers are probably missing the baffles too. That would prevent some of the oil from splashing up that far.