Hi Folks,   Well I'm just making some progress on diagnosing a problem I mentioned here a while ago (see http://www.w-body.com/forum/viewtopic.php?t=15679).   Anyway, I'm pulling the cam carriers off to inspect the valvetrain (The rear one is off already, front one should be off sometime next week). Now, I"m wondering, How do I tell if a lifter is collapsed or not?   The valve springs and valves stems look fine on the rear. While I've got it off, I'm going to go ahead and pull the cams o