The older 350's like his are rated at 4000-4400 I believe as I know a lot of the old timers don't like to spin them faster than 3800-4000 when they prop them. So at 4000 WOT it isn't that bad, but there is room for improvement. Also verify your tachometer is correct before you go much further, but I would think a vessel of that size should do well with a 16 pitch large diameter.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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