Monk used Chrysler Crowns and such in his "heavy cruisers" which were were sometimes displacement, other times semi displacement. There are still many around here in the PNW with the original gassers. When I was just burning time over-thinking my repower project, I was thinking that a slant 6 would have been a great engine for my purposes if it was marinized and supported. I do believe that gassers would last a lot longer on average if only they were cared for. Many folks with 30+ foot boats hit the marina, fire it up, get outside the no wake zone and put the hammer down because they can. Anecdotally I have a marina acquaintance who runs his single Volvo 5.7 at 4000 rpms as his cruise speed on a 28 footer. The mechanic loves him.
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