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Question regarding cruising rpm's


Hi folks,
I just got back from a trip and ran my 6.0 Crusader's around 3200 rpm to 3400 rpm's. The Mariner weights about 9 tons.
I mentioned this to a friend and he said that I was nuts running over 3k. He said that car engines never run that high and the I will probably shorten the life of the motors.
On my last boat which was a 34 ft express cruiser weighing in at about 13,000 lbs, I never ran the 454's over 3,000 rpm's. I sold her with over 2,000 hours and never had to rebuild the motors.
Am I pushing it at 3200 to 3400? Thanks for your thoughts.

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