My 9.25 to 1 comp. ratio 512 stroker 400 block motor made 612 hp at 5000 rpm on pump gas with a set of ported "906" that flowed 266 cfm at .600 at 28 inches.That is 2.3 hp per cfm, I was very happy with that. Your results may vary.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)