Did you check that cyl for coil bind? You may have broken a spring and it is not allowing full travel of the valve even though it is still holding the valve closed. Also check for any foreign material in the valve springs on that cyl. Had a friend once that found a chunk of metal inside a spring that must have been there since the shop did a valve job and it finally fell between the coils causing bent push rods.
Been there, Done that, Hope to live long enough to do it again. Big Bill I.I.# 4698
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