i have a 1980 mckee [whaler copy ] 17 ft hull is dry and slick
running at 5800 wot 1983 evinrude 175 boat rated at 140 ,
it was running 47 mph with scored cyl and bad wrist pin bearing,
with the 150 powerhead ,its know evin 175 powerhead tuned well
what king of speed can i expect, and better...