As stated below, 4.3l V-6, 2bbl carb, Alpha 1 Gen 2 outdrive. I've run the boat the past 2 seasons with the 23 pitch prop the boat came with. With that setup, I have run about 45MPH (GPS) @ 4400RPM WOT. Mercruiser states that the WOT range for my setup should be 4400 - 4800 RPM.
Upon the advice...