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    High five 21p five blade prop running 5000-5100rpm on 4.3 mercruiser

    Hi ! I'm new to iboats and boating in general. I have a 93 gw invader 18 ft bowrider with a 4.3 mercruiser alpha I in it and it has a stainless Mercruiser High-Five 21p prop. I'm getting 47mph at 5000-5100 in WOT. looking around this forum it sound like this motor needs to be in the 4400-4800rpm...
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