Thanks to the Corp of Engineers strategic location of a unmarked wing dike 18 inches below normal pool and half way across the river, I'm getting a new lower unit and prop.<br /><br />boat is 21ft 5.7 mercruiser. current prop is a SS 13.75(about) X 19<br /><br />I'm wondering if I should make a suttle change since I have to get a new one anyway. The boat seems to have plenty of low end. It'll pull me up (215lb) on a slalom ski pretty easily.<br /><br />It runs out to about 4500 RPM at which point, I think, the rev limiter kicks in.<br /><br />I'm thinking of proping up just a little (20pitch?)to lower the RPMs a little and maybe improve mileage during normal cruising.<br /><br />Any thoughts?