Love them Screamin' Jimmys. I work on two boats (volunteer work); one's an 82' Coast Guard cutter with two Cummins 1710 main engines and two 2-71 gensets, and the other's a 40' former admiral's gig with a 6-71 main engine. They're loud, they're noisy, but they're the simplest engines out there, and in my experience quite reliable. THe 40' flooded up to the top of the engine's valve cover once...we pumped the water out of the boat, drained the oil, put fresh oil in, and fired her right up. She ran great in spite of being immersed in the water for at least 6 hours (more like 12, probably) and still having a little bit of water in the crankcase. Ran the engine a few times, pumped that oil out, and it was almost clean and free of water. We'll need to drain the tranny again, but the engine's good to go as soon as we put oil and a filter in there.