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HI all, I have a great little 1976 Glastron 155 trihull with original Johnson 85 hp. No tilt/trim......still running like a top. Question is the prop. It has the original 13 1/4 X 17. Lots of low end hole shot but tops out about 38 mph by gps. NO tach. Would you OMC guys recommend the 17 pitch...
