Originally Posted by endeavour32

I bought these engines from Tinkerer I have not dyno'd them myself and I don't think I got an RPM number from him. I know I was told to prop them between 5600-5900. I'm currently at 5600 and I'm happy there. When prop testing I started with 30 bravo's and spun them at 4800 RPM's. I ended up with 26 Bravos at 5600 RPM's. Speed gain for proper RPMs=0. I started at 80 and ended at 80 and I tested well over 5 different sets of props. The one thing I forgot to mention is I'm running 1.8 rockers on the intakes so that will change things slightly.

Did you see Mild Thunders post on all the various cams and the results? The best average power came from a 741 cam. I'll be honest, I was rather shocked at the results.

Originally Posted by leif

Anybody know these motors are they good built motors..looking at 510 ci 690 hp n/a..thanks for any input

Originally Posted by leif

Bandit performance marine

Originally Posted by mike tkach

they advertise a 700 hp 509 on their website but no information about c/r,type of cam.they do say aluminum 320 heads but no mention of the brand.they do say cam by crane.i sure would like to know more about this engine.

Originally Posted by endeavour32

I'd want to know what heads they are using, what compression ratio, and generel specs of the cam. It looks like they are using the profiler intake, so maybe they are using the Profiler 320 head, which is a good head but they don't mention a thing as to the brand. At at a bare minimum least I'd want to know where the engine makes its power.

IMO, there is no way they are building 700 hp out of a 510 CI engine. For comparison here are my engines which are 650 hp. 509 CI, Crane 741 cam, 10:1 cr, Dart Pro 1 310 heads (ported by Jim V to 320, it takes one hell of a head to out flow these, they flow 394 cfm @ .70), Dart intakes and holley hp 950 carbs. I'm sure there is a bit to be gained by going to a bigger carb, have the intake ported and bump up the compression a bit more. Either way I don't think there is another 50 hp to be found, maybe but I doubt it.