A blown head gasket is the most likely culprit unless there's a crack in the water jacket somewhere.

It's a zero pressure cooling system but the crankcase oil pressure is 7-15psi so oil is more likely to flow into the cooling sytem through a small gap rather than the other way around.


1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)