I have been visiting this site looking at the Mercruiser 470 4 cylinder info for some time. I have a 22' tripple pontoon boat (over 4,000lbs) with a 470 and I am interested in figuring out how to power it up. Anything I try I'll post my results and let you know the real deal for my application. I have been impressed with the post's I have seen and I am excited to jump in and join the fun.