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Cummins all of a sudden wont hit rated RPM


For whatever reason, my 396 running 370 Cummins will not hit its rated rpm. Both engines are topping out at ~2800 rpm (should be 3300) There was growth on the running gear and bottom, which I had a diver clean. There is no increase in the boat weight and even ran today with 1/4 tank of fuel.

Is there anything from a turbo charge or fuel I should be looking for? Two engines, would one working at 100% pull the other up to rated RPM?

Looking for trouble shooting ideas please

Thanks

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