i should have mentioned the motor had been changed to a 300 hp 350 gm about 6 years ago and i will confirm rpm tomorrow at the lake. thank you for in put.
i have a 1987 Sea swirl topaz sport with an OMC cobra 5.7 liter motor 300 hp and have been using a 14 1/2 x 19 3 blade prop top end rpm is 5400. should i use the same in a 4 blade prop?
