OK - here's the story...
Starcraft Medalist 1601, 16.5 ft, 2.5L 4 cyl engine, 1987
Bought boat 5 yrs ago....had 15p prop on it, would only turn 4000-4200 rpms
2 yrs ago bought lower pitch prop to turn higher rpms.....
put 13p prop on it, turned 4600 rpms
4600 is right on peak rpms by the...