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    Newbie prop swap Volvo Penta 8.1 Gi-B 375 HP

    I have a 2002 25' Monterey bow rider 7400 lb dry wt with a single VP 8.1 Gi-b 375 HP engine, DPSM outdrive with 1.78 ratio (VP#3868912). Boat currently has Duoprop F8 set 3851498 stainless props. Engine manual lists optimum operating range at 4200-4600 rpm. In-dash tach says it's at 4200 rpm...
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