i have a 21 ft searay i/o that needs more power and i dont really want to put through transom exhausts on it. Need to keep it as quiet as possible. It runs fairly well at 53 mph right now with the 220 hp 305 chevy engine but not quite good enough. Hull handles too well to stay at 53 mph.
If i kept the exhausts like they are now ( through the prop) , how much power in a sbc 400ci could i build before the exhaust would be just too restrictive.