I have a 1988 OMC 5.0L (Chev) that I just got to start a few minutes ago. It purrs like a kitten and then water starts spewing out of one of the exhaust manifolds! I looked and there is a 4 inch long crack in it. I looked at the other side and it is the same way. Am I going to have to replace both of these or could a machine shop weld them or what. Also what caused this? Did the last guy not winterize it properly? Any advice would be nice. Thanks Kep