we just built a sb chevy 355ci. it has aluminum weiand intake and aluminum heads. the heads are holly made by broadix. my problem is it is leaking oil at the back of the intake. it is blowing bubbles of oil " i kid you not". i didn't think there should be that much pressure in the lifter valley. i was told to do away with the front and back gaskets on intake and just use silicone. any suggestions about back pressure. have moroso valve covers with breathers.