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I'm trying to get just a little more cruise speed from my 270 Amberjack. I recently re-powered with a new 6.2 Horizon MPI 350 hp from an original 6.2 320 hp. My current prop is 16 x 20 4 blade front and a 14 3/8 x 20 3 blade rear. WOT is 5400 @39-40 mph I cruise @ 4200 rpm with 26-27 mph, I...

I'm getting ready to rebuild my 6.2 MPI Horizon engine with 1060 hours on it. I plan on beefing up the HP to 360-370 range and trying to get the torque up as well hopefully @ 450 ish. Currently with the stock 16 x 20 & 14 3/8 x 20 dual prop on a Bravo III with 2.20:1 gears i get the following...