I just aquired a 74 sleekcraft rebel. It has a olds 455. I don't know to much about jet boats but I have heard a lot crap how the olds 455 sucks. I figured we will use it for the summer and start fresh this winter with a 502 or something. The motor was just rebuilt. The only thing we upgraded was the cam. Its a hydrolic motor so not a whole lot i can do to it with out waisting a bunch of money in something that will be history this winter. One thing though I want to make sure we have the water lines hooked up right before we try starting this thing again. Does anyone have a chart or anyone know of a good jet boat mechanic in the dfw area???????