596 head performance mods

One guy says he can hear the difference 'sound wise on the bench', another says the difference is 5-6cfm, must be because the 340-360 heads have a deeper pocket=taller short turn then the chevro therfore more of the flow coming off the turn has to pass over the tapper/transition, which doesn't look like much but it is what it is.

I wondering if your removing a lot of material, drastically modifying the port, making a more straight shot if that still is an issue....