I searched but could not find a specific topic on this. I was diving my rv with a 454 4-bolt main and Turbo 400, crossed RR tracks and going up hill (5mph) and the engine made a loud racket.To sum it up, bent push exhaust push rod, all 4 cylinders on pass side had water in them and get this, if you got the oil plug removed from the pan, the water you pour in the radiator comes out the plug hole as fast as you pour it in! (yes Im pouring it in the radiator) I suspect a cracked block, but others think it may be a head gasket. Wouldn't the rings slow the water down alittle? What ya'll think? Thanks