I was just randomly reading through some threads. Years ago I had a real bad blow bye/blowback problem with my Comanche 4.0. Oil was going straight into the air filter housing. So I made a catch for it, I had to check it often. After redoing the head and a lot of work to the truck blowback basically stopped. Then I ended up putting a little air filter coming off the valve cover. You can pick them up at any auto parts store.