First hit on the dyno

Those power figures and flows are about right. The 440/496 had RPM heads that flowed 292 @ .500" and 309 @ .600". Used a 249/255 solid roller and .585/.600 lift. It made 642 FT-LBS @ 4,600 rpm and 641.6 HP @ 5,800 rpm.

Our RPM heads just like roccodart440 made 787 HP @ 7,200 rpm with a pump gas 400/451.