An engine expert said meh about my Ferrea valves, and really had a don't care about the valve weights or materials when i showed the Titanium intakes, and RA-IV valves. BECAUSE my engine application is limited to < 5500 RPM.
His eyes (as were mine) were more on the backside shape, for best valve curtain upon opening. Ferrea & Ti-alloy have the best low-lift valve curtain. RA-IV intake is a sunk valve by comparison.
As for the spare engine going Roller cam and high rpm; Pick valve having best flow at mid-high lift, without turbulence ( or flow choke evident by the numbers).
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