Just got back from the Vrbancic Brother's dyno today with some real nice results. This is for a car, but with the installation of a marine oil pan, a little less compresison and timing, and this would be an honest 740hp/700+lb ft. pump gas 509. It made 746hp @ 6100 and 720ft lbs @ 4800 at 32 degrees total timing....a loss of 18hp and 12ft lbs on the race gas.

Gen6 509
4.5 bore x 4.0 str.
Scat std. weight crank
Engine Pro 6.535 rods
Mahle 13cc dome piston, 1.27 ch
11.4:1 cr
AFR 305's fully ported (309cc), 2.25 valve, 103cc chamber
Straub hyd roller 244/248 @ .05 .649/.629, 107
Morel hyd. roller lifter.
Ede. Vic Jr, fully ported , Pro Systems 1000 4150.

Corrected (.04)
764hp @ 6200
732 lbs/ft @ 4900

four views and no responses in two days, and no one else can see this. Nice, guys.