If someone redid the head, they did a great job EXCEPT on that valve, because the cam towers lined up perfectly and the cam spun perfectly with not even a hint of binding when I reinstalled it (there were no shims under the cam bearings). However, the P.O. really let the "noise" go way too long, to the point where what was left of the cam was banging the gouged-out cam follower to slam the valve down. That could not have done the valve/valve seat/valve guide/springs/etc a world of good.
I'm thinking now of putting in a +1 size shim which MIGHT help nurse this along until I get a complete valve job. That should be big fun. Even if I manage to do this myself it's going to be maybe 500 in tools, 500 in supplies, and 1 for the heads
. I assume the worst and will wind up Heilicoiling.