I have a 1991 Fountain 27' with a bone stock 502 mag and a Bravo 1 Drive. The motor has a little over 600 hours of fresh water use. I am wondering is there anything that I can do that will give me a noticeable increase in H.P. or Top end speed..? I dont want to do anything to radical that could hurt my motor especially with the high hours on it.

I would change the cast iron exhaust to something better, you would save weight as well. Would leave the engine alone with those hrs unless you want to freshen it up completely.

bl