[cleanspeed1]

The military spec manifolds flow the best, and the exhaust manifolds off the Hummer are almost like short tube headers. The ultimate solution though, is putting a turbo on that thing. Win,win. The thing that kills the pumps with waste oil is the filtration situation and the removal of water and acids from the stock. The Stanadyne DB pumps are pretty intolerant of contamination. The stuff needs to be heated.