Reply to "Oil Flooded Valve Cover"

The oil drain back passages can be blocked partially by the head gasket, and the intersection of the passages between the heads and block often don't line up very well. This is an area that requires blue printing when a motor is being rebuilt.

Evacuation of gases from the crankcase is a necessity. Blow by past the rings is building up pressure in the crankcase. That pressure is going to escape the crankcase by flowing out the breathers. So you have crankcase gases flowing up the drain back passages the oil is trying to flow down. This is slowing down the flow of oil out of the heads. If you don't have enough vacuum for a PCV valve, install one of the Moroso aspirator systems. Ideally the aspirator should be connected lower in the engine, near the crankcase, but away from oil splash. This way the air & oil are flowing in the same direction within the motor.

However, the roller lifters are almost certainly the main problem, flowing too much oil to the valve gear. And if anything, the hi volume oil pump would have only made things worse, as it flows 25% more oil for any given rpm. New lifters and push rods with 0.040" restrictors will be the best fix short of tearing the motor apart and bushing the lifter bores.