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There are other differences that needs to be looked at, some marine engines were opposite rotations as the boats back then did not have reverse rotation transmissions. Most marine engines that are cast to SO specs. are drilled as a center oiler. The service block of choice is a 1968 cast block. Last, it was mentioned that the SO was the advent of the need to run 7K for extended periods of time. The Lemans crank was not only crossed drilled but also have a journal from the front of the crank to the rear.
Good luck
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