So I swapped a 4.3 automotive motor for a 5.7 mercruiser. I have a 1.84 ratio as of now and put a mirage+ 23p on it and hit 48mph with 3 people. If my tack was correct the rpm was at 6k WOT. The boat is a 1994 20' rinker captiva 209 openbow. Has anyone done this swap with that gear ratio and...
