Originally Posted by timothale
A lot of the Chrome VW Bug engine parts did not have internal air baffels to properly direct the air around the Cylinder barrels. The cheap ones could result in hot spots. I remember seeing a T bucket with a Corvair engine in front . like a regular T bucket but all the shrouding had been removed, I had a couple Corvair powered buggies and if the Air flaps didn't work you would soon loose the pushrod seals and oil would coat the whole back of the car, and hit the exhaust and leave a smoke trail down the road.
This brings up another point about good vs. not-so-good aftermarket valve covers. The valve covers should come equipped w/a baffle for the PCV valve, else the PC valve can pull in oil. Inferior covers often lack any sort of a baffle. Some baffles are just rudimentary flat tin shields as opposed to a labyrinth-type baffle like comes stock on many sbc engines.