I have some questiions on supercharging my 502efi?Any info would be great. I have a 29ft scarab and want more top speed. How reliable are they and how much gain am i going to see? What is the best name brand out there? Thanks

I bought a 96 26 ft that came with a stock 502 with a procharger the boat ran great until it threw a rod through the side of the block. After talking to the mechanic I was told that on these motors they have a weak valve train and that one of my valves broke and fell through the piston due to the added heat of a super charger and that you should never put one on a stock motor it will run for a short while but it will definetly be an expensive time bomb. If you do put the super charger I would highly recommend adding stainless valves and stronger pistons I have a procharger with an intercooler and am very happy with it. The other very important thing is to get your fuel system correct if not you will lean out the engine and definetly blow it
Check out this web sight www.cathouseperformancemarine.com
very satisfied with the work he did for me

Thanks for the help!!

A friend of mine has a 29 with a 502 in it with a whipple charger it puts out about 640 hp stock he run 58-59 after the super charger he ran 70-71 but he goes through at least one drive a year its a bravo one drive

There is a guy here where I live with a 29ft with a 598 ci 700 plus h.p. that runs 80 but also goes through drives reguraly, He has an extinsion box and gained a few mph with that addition