Quote Originally Posted by Powerabout View Post
We used to race 6 and 25 hp ( 1980) with that style of gearcase and we could go as high as 1 " below ( propshaft that is) and the prop would deliver the water to the pick up no probs
Ive experimented with my Airborn & a SS performance prop stock to the OMC 25 [not a surface prop]. It had a limit of the anticav-plate being about 1 3/4 above the bottom [flat]. Any higher it would cavitate hopelessly. Anywhere below where it would run was fine cooling with many miles on at 39-41mph.