A while back to the car to dealers to get a check up. So they said I need valve gasket replace the left side but could not do right side took to dealer and got a alignment $ 698 total cost. Has only one replace the right side them self.
i have and it was lil bit of a pain. driver side gasket isn't to bad and was doing tim c pulley upgrade at same time but had to remove cowl, wiper motor transmission, battery, battery tray, air intake y-pipe and pipe that goes into throttle body, fuel injectors on pass. side due to fuel rail nipple not allowing enough clearance to get valve cover up. worst part was that we did it in a garage not at dealership where i work and main bulk wireharness is routed up against pass. side valve cover and has 2 15mm bolts and some brackets you gotta get out which was a pain in the ass. fuse block had to be loosened and moved back. after all that valve cover still was a pain in the butt to get out and put back into place. was def not a 1 hour job lol. coming from opinion of a gm tech it was a pain in the ass lol