My head with the same valve adjuster issue looked surprisingly "good" upon disassembly, valve guide wear aside.
I expected serious seat recession, or heavy valve tuliping but could only see some heavy burning.
Not an easy thing to measure either, e.g., compared to the other head. I guess it's a sum of a number of small faults, rather than one glaring one--best left to a real machinist, not an amateur like me.
"I hope it feels so good to be right. There's nothing more exhilarating than pointing out the shortcomings of others, is there?" Randal Graves