OK guys i got the shaft and prop back in the boat and tested it yesterday. I went with a 17x15 with medium cup. I got 4600 max rpm out of the engine and hit 40mph wide open. I was cruising at 25mph turning 3000rpm. speed felt good and engine sounded good to. It was to calm to see if the larger prop would help with my cavitation issue but ill try again this weekend hopefully they'll be some chop out there.
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