[Excaliber]

It's a simple question ERA Chas, what do your Shelby heads flow at 500 lift? As I see it, and the numbers tend to vary to some degree, that would be 293.8 cfm. More of course at higher lift. So, I don't see a problem here,,, 320 at 600 lift? OK then, no problem.

When comparing flow data it should be noted at what lift, at a bare minimum.