I just finished changing my valve seals on my 80 firebird.. I adjusted the rockers and drove for a while...was about 1 week and than I got a tick....I remove valve cover adjusted valves and was good...than 1 day later again...adjusted.....ticked after 5 mins of driving...it is all on the drivers side and not sure if it is the same one....when I remove valve cover I back off till I hear it tick loud than turn in and do this till I find the right one....I think it is the 3rd and or 4th one back....I have a big cam and roller rockers....but I have been running this engine for some time and never had a problem....I am thinking the studs are starting to come out, they are pressed in.....now my question is....1. how do I pull these studs out ? 2. can I just tap the holes while heads are installed on car or do I have to remove them and send them to machine shop?