>>>*It is possible for a valve to hang up in the guide but this is pretty rare if clearences were correct.

Usually when one appears down it is bent. It should not be if the cam and short block were in time when the head was snugged down, though. Plus if one is bent there is usually at least one more also bent.

I think I would pull the head to see what happened......*EB

*Beats the he** outa me!....*LOL**...