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That is what the manual says, (so Bullbat is correct). That said: if the engine is in good shape it will turn 6,000 with no problem, (don't run it there all day).
In fact you should prop it for 5500-6000 with a very light load @ WOT so it runs properly with the loads you plan to run in the boat.
This assumes the engine is in GOOD corndition (as I already said).
The inline6s luv ta run @ 4,000 n' cruise n' cruise n' cruise.