Speedboats can place tremendous stress on their engines because they will make fullpower blasts for sometimes an hour or more. We build a Whipple supercharged big block Chevy (actually two of 'em) to make nearly 2,000 horsepower worth of thrust for a ridiculous speedboat. Check out the differences versus a similar build for a street machine or even racing.
Engine builder: Prestige Motorsports https://www.prestigemoto.com/