I have a 2001 2400 scr. Well while changing manifold and riser and did a compression test and found 4 bad cylinders and need to replace the engine. I have a 5.0 merc and looking to repower. It had an Alpha with 1.6 ratio. What's the highest horsepower power I can do? I know the Alphas have a max of 300 but have heard they can handle a little more. My goal is to get up on a plane with 4-5 people on board. Will 5.7 vortec rated at 300-330hp be good? Any recommendations? Thx
the alpha will handle the 5.7... I did a repower with my other boat(1998 trophy 2352 about the same weight as yours)... went from a 1998 305 to a 2014 350 MAG MPI(320 HP)... just remember you do not have a drag boat so don't hammer the gas all the time and you will be fine... and BTW it changed the boat completely I'm SOOOOO happy I did it!
Alpha's have a max HP rating of 300HP. Yes, you can go higher, but make sure you're not hammering it and keep the handle on the throttle, getting ready to chop [in case] the second the prop comes out of the water. (ala offshore racer style).