I spent alot of time dynoing my 540 last year,I made 657 hp at 5400 and 665 ft lbs tq at 4800 using a ported 2000 502 mpi lower,stock upper plenum and a bored out throttle body on Crocketts dyno with CMI headers with the blower belt OFF. Keep in mind my motor is built to run as a blower motor so it only had 8-1 compression and a cam ground for max power running my blower too so it would have had a little more tq and probably a few more hp. My boat (272 Baja) runs 76 mph with a 26 pitch labbed 4 blade with this set-up,my drive has a nose cone and hd xr internals plus upgrades for when I'm running faster with the blower so there might be a mph or 2 gain in speed if I had a std drive. For reference My boat ran 62 mph years ago with the stock 502 mpi. I searched high and low trying to find someone to bore out the throttle body,I now have a source if you need it done,Smitty

mine is user friendly since 2000 its been pushing 650hp, I WILL CHANGE MY CAM AGAIN AND INTAKE CARB, should be about the 750hp its lumpy at idle with the 114 center its idle was 600 to700 it will be under 1000 with the new cam just alittle lumpier:p:D. I have only about 50 hours on it my bodys been broken for the last few years. but hope to be out running in july and save racing for next year. art