Its interesting, though, that a lot of the cam/lifter failures are on vehicles that spend a lot of time idling (per the owners stories). Not ALL of them, but quite a few are used in situations that require a lot of idle time. I notice that the oil pressure goes up really quickly just barely off idle....would be interesting to see if the idle was raised just a tad, does it help get rid of some of the cam/lifter issues.
Not sure if it was this forum or not but someone had an excellent post on where the oil flows through the Hemi. It seemed pretty complicated and with a lot of small passages and twists and turns.....I wonder if a small amount of contamination, varnish, break in metal, etc could block it enough to cause an issue....whereas higher oil pressures would be able to overcome small obstacles, lower idle RPM pressures might not.