I dropped off a nice set of 64 Buick 300 heads at a machine shop that had been highly recommended...
A picture is worth hundreds of swear words.
In this case the guy operating the seat grinder had to be stoned or drunk, nobody is this incompetent. Look at the seats, especially the exhaust seat, they are ground away and recessed into the head at least an EIGHTH of an inch. W.....T.....F?
Yeah, that's just dandy.
The stem hanging waaaay down is, of course, the heavily recessed exhaust valve.
I'd rant and rave like a lunatic, but they refunded the money and paid me what I paid for the heads, which I still have. I don't know, maybe much larger seats and valves can be installed.