Ever since I got my truck back it's had a ticking sound coming from around the pass side valve cover. Today I was working on anything and everything in my engine compartment. So I ripped my valve cover off started the truck and starting looking for the tick. I checked every valve nothing. So I shut the truck off and took every pushrod out and rocker. Not a thing wrong. So I put every thing back. Started the truck up still there. So I started checking the bolts on my head (exhaust) and a couple of the bolt holes where stripped. So I have a exhaust leak not a bad valve. So tomarrow I will replace my plugs and take my heads of and clean them then retap the holes.