906 heads and 740+ NA horsepower?

I've been pooh-poohed enough on the claimed flows.

I'll just say they do make the 748 HP on the 91 octane pump gas, 11.9:1, 500" engine.

And 694 HP on the 91 octane pump gas, 9.7:1 compression, 451" engine.

There are enough guesses out there on how many horsepower you can get per cfm.