I'm not sure what I'm looking at, even blowing the pic up. Any way of marking the seat to better see what you're taking about. I really want to understand what you're showing, very interesting, thanks
The 45* on the original seat sits well below the transition into the chamber. The larger valve with the recut seat raises the valve up out of the "hole" which improves the low-lift flow (less obstructed path into the chamber).
