I know before I ask that this info may not be something you'd want to share but if you PM me I promise not to share the source.LOL I'm working on a couple of sets of magnum R/T heads and changing from the small intake valves to 2.02". Not sure what seat angles/widths and if a back cut on the intake valve would be a good idea. Mild bracket/street strip engines 1 flat tappet,one hyd roller under .570 lift cams and under 6500rpm. Thanks for any help.