3800 Open Props/ Cruising Speed HELP

[Uhehner]

I agree too.. Most boats are over propped from the factory to start with. If you over load ( over prop ) a diesel it will raise the exhaust temperature and cause all kinds of damage. Plan on a $15K - $20 K repair bill. Just ask my brother with his Cummins. He now has temperature gauges on the exhaust.
You want to reach the rated RPM under an average load of fuel, water and people. Capt. George