Diesels in offshore boats....what about Magnum?? They raced one in the Miami to Nassau and back race years ago. 70+ feet, twin large diesels. They had like 9-10 people on board and the ocean was rough. Don't think they ever pulled back the throttles. Even when someone dropped a drink!!!!
Saw a Cary in Ft. Liquiordale with four turbo Lehman Ford inline 6 cyl. diesels. Four Merc outdrives. I think they were 450-500 hp each.
True not real popular, but they do preform.