Bottom of lifter worn thru

I've noticed in several fairly recent threads where members post their cam break in videos that they are letting the engine run at an RPM that's way too low to be acceptable. Cam break in is supposed to be at 2500 and UP varying between that and around 4000-4500 for the first 20 minutes or so of engine run time. Yet, for some odd reason, I've seen videos of NEW engines idling and running below 2000 RPM. People just don't get the importance of it. I think there's more operator error involved than anything. I remember when all the ZDDP was being reduced the first time around. Lunati had a rash of claims for bad camshafts and lifters. While they made good on most of them, they also found out that they were not at fault. No matter how hard you tell people how important proper cam break in is, they just will not listen.

I was noticing the same. People just standing around an engine idling while the cam is supposed to be getting broken in. I kept my RPM moving all through break-in like my machinist and you both told me. "don't let it drop below 2500".

Could some of them possibly been using roller cams?