I need some info. I have a mint 1995 Rinker 236 Captiva Cuddy, about 125 hours on original 454 carb. 300 Hp motor, 21 pitch SS mirage quicksilver prop. It runs 63 mph @ 4600 rpm.It also has Baja SS corsa through hull exhast. I don't need the fastest boat on the river, however what do I need to do without spending a fortune to get this thing running around 72-75 mph. My local Rinker dealer says it can't be done. I told him he must be crazy because HP means speed.
Any suggestions would be greatly appreciated.