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Looks like they cnc’d a couple of angles below the 45 on that assembled head.

Probably works pretty good.

I wouldn’t be surprised if they checked out fine for guide clearance and seat runout.

Edit:looking at the bare head pics again, it looks like maybe those two angles below the intake seat might be there on that head as well.

I wouldn’t mind seeing a more up close pic of the intake seat on that bare head.