It's really amazing the abuse that Jimmies can take, perhaps more so than most 4-strokes, but that's just anecdotal opinion.
I had a 50 ton, 65 footer with twin Gray marines. They were aluminum block surplus WW2 generator set motors. I remember the aluminum was all corroded where the water seals fit on the block. Likely from neglect in coolant and anodes - hence water in my oil when I purchased the boat. After consulting with my mechanic-uncle, I cleaned up the AL, ground them smooth, then reformed them with JB Weld.
Worked like a charm and ran for years and thousands of miles.
Honestly if I ever had to repower a boat, I would not purposely install them again. There are more modern solutions. But they are examples of amazing machinery.
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