I have a 2000 253 Convincor, we pulled out the 502 and tried a little experiment. I replaced it with a 555 ci all alluminum, 6lbs boost procharger, EFI with a FAST programmable fuel injection. Running a XR 1.50, Imco hyd steering, still playing around with drive spacers to get the x dimension right but I think I'm close. The engine dyno'd at 830 hp, at 5100, over 800 ft lbs torque above 4000 rpm. The fastest GPS number I have seen so far is 101 mph at 5100 rpm, 34 pitch bravo 4 blade. Have to run alot of trim tabs to keep the hull stable above 80 miles per hour. I'm looking for some advice on IAC programming or any other Fuel Injection parameters that affect idle transition. The engine is a little temperamental when docking, wants to die when shifting from neutral. Any help is appreciated.

Holy Crap Batman!!! those are great #'s!!!!! you might want to talk to Checkmate300 he runs a big hp single engine check its a turbo but I think he could help.

Try JimV.

Jeez, some of the planes I fly don't go that fast,,,,,,,,,,,,

Did you get that idle thing going? Id like to o the fast computer myself. Greg

I had a '98 253 and it was a great boat. It would dance a little when it reached the upper 70s, but still tons of fun. Good luck!