Hi, been a member for a couple years but first time poster. I wanted to post a question about an 07 with a 3.7 that dropped a rockerarm a couple times. After paying the shop 300 twice just to pop the valve cover and put it back only to have it go again a few miles later. I took off the valve cover myself. That's when I found the lifter was dead. Wonder why didn't the shop check? A few others were beat too so I order replacements for the whole side. Tried to crank it over but it was miss-firing like crazy like the valves weren't closing all the way. Anyone have any thoughts? There's no valve lash adjustment soooo.... Replace the head? Please say there's another way it can run that's affordable and not a P.I.T.A. Thanks!