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#1
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try a timing light too.
what pitch are you running now... probably a 15 would be right... I bet you have a 19 now fwiw my cruiser runs 17's and tops out at 48 mph and 4600 rpm 
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#3
07-06-2013, 07:23 AM
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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. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#4
07-06-2013, 01:32 PM
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the diameter will make very little difference on top end but MAY affect holeshot... I'd drop to a 15x16 or a 4 blade 15 pitch
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