Yes, in the picture of the cleaned up head, that was a high compression head so there was very little material on the short turn side of the valve, basically the short turn side is "mostly" unshrouded on that head so they left it alone. On my low compression head the chamber is much deeper so I took steps to unshroud the short turn side, even though my short turn radius still blows.
I'm wondering if I could safely shave 0.10" off the bottom of the head? That would put my compression, even with the chamber mod's, right at 9.0:1, maybe a smidge higher.
Rebuilding an OHC Pontiac 250 with EFI and a Turbo