what causes oil to come up into the oil cap while the engine is running? the engine is in a 1970 stang. 302, 2V, c-4 trans. i have a pcv valve in the right valve cover and a push-in ford motorsports oil cap in the left. the oil cap has a place to put a hose that would go to the air cleaner, if my air cleaner had a place to connect it. right now i don't have a hose on it. it is blowing enough oil to make me mad on my chrome valve covers. what would cause this or what do i need to do? any ideas...