I'm going to show my ignorance here but I'm gonna ask it anyways. Did the older roller lifters have bushing type bearings or have they always been needle bearings?
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They all have the needle brg. rollers.
What makes this Hemi tick thing so confusing is there are many sources that cause a similar noise/tick.
Personally I am convinced the "normal" Hemi tick, the tick that is there from new or almost new and it is made better or goes away with different oil, has nothing to do with the cam/lifter failure that also causes a tick.
Also I think the "normal" Hemi tick is not detrimental or a sign your going to have a failure.
The hard part is telling the difference between a lifter/cam failing and the "normal" tick.