My car developed a miss and a valvetrain noise awhile ago. I parked the car because I didn't have time to look at it. I drove the car a little bit today and under light throttle the car drove and pulled great but under heavy throttle there was a lot of popping and skipping so I knew there was a problem that amounted to more than "needs a tune up". I pulled the valve cover and noticed the number 7 exhaust valve rocker arm wasn't moving hardly at all, so I removed it. I then saw the retainer had broken and was kind of cockeyed on/in the spring. The pushrod isn't bent. Its an LT4 retainer so I'm going to go to my dealer today and order one. I really HOPE that I can replace the retainer and call it good. What do you think the chances are I could have a broke spring or bent valve? If I have a bent valve do you think I can get away with just rebuilding that one head since I dont have a ton of miles on the motor?