How do hydraulic flat tappet lifters fail?

Righty Tighty said

Yes, they were new. And yes, that’s the rocker end. All of the lifter ends of the rods look perfect. Maybe I got the length wrong? That’s just wishful thinking, because that’s the easiest fix...

Click to expand...

Did you measure your preload? That could cause some major problems lunati lifters require. 020-060 preload if the pushrod are too long they would exede that preload. Seems to me it would have bent a pushrod during break in tho. Did you have any bent ones?
Lack of oil would probably cause those dings.