what would cause this?

What would cause an engine to leak water out of the oil pan? I bought the truck with a "blown head gasket". I replaced the head gasket, and this is what it is doing now. I am trying to sell it, it's my D-50, but no one is biting on it, so I am going to yank the engine and try to find out what would cause this. If anyone could help, leave me a comment or sene me a PM..