Quote Originally Posted by pat mccarthy View Post
old locking nuts do not have much holding power could be backing off if not poly lock nut s . like jerry said rocker stud could be backing out of the head cast quick check with a straight edge .or rocker is worn out and going in and out of lash the tips of rockers will get a spot that looks like this ) if real bad it will start cuting in to the rocker stud . if a stock steel shoe rocker the KD tool or someone made the wire clip ones. they work better then the tin stamped ones also check for a small hole in the header or gasket leak at ex side of the head
or a cracked flexplate.....