heavyc
New Member
I have a 79 260 weekender with 260 merc alpha 165r gear ratio it has a 15 p aluminum prop have to keep it about 3800 rpm to be cleanly on plane tabs up and trimmed up a bit runs about 22 mph at 3800 wot is 4600 tried a 17p stainless comes out fine but have to keep it about 4000 rpm to stay on plane any ideas I know this boat is heavy but rpm seems a little high bottom is painted and ran with about 60 gal of fuel 2 fat boys on board also engine is fresh boat came with a 305 cracked I replaced it with a 290 hp gm performance parts crate eng.