Watch out for all that oil !! Before you start it with the valve cover off look and see if the stud has pulled out ( if you have screw in studs disregard) I you have made a correct adjustment cold ( screw down to zero lash then a 1/4 turn more) you should be close. if you have good oil spray out of the push rods then use a 1/2 rubber hose for the followingPut One end to your ear and the other to the suspected rocker. You should hear a tap if the problem is there. A tap sound may be the exhaust as listed above , but a sticky valve in the valve guide will also do it.