How do hydraulic flat tappet lifters fail?

PRH said
If you wouldn’t mind pulling the guts out of one of the lifters........ I’d like to see if we could tell who made them.

They’re supposed to be either Hylift or Eaton....... which used to have different styles of metering to the top, which could be used to tell who made them.

I don’t know what I’m looking for here, but here’s a lifter taken apart.

dartfreak75 said
Was that a new pump? I don't know that wouldn't find a new block and just start completely over. Just for the fact that this is the 2nd failure in the block sounds like bad juju! Lol

Brand new pump. Yeah, maybe the block has some bad juju...but maybe I’m also not a great mechanic?? I’m careful with everything I do, but it’s hard not to get frustrated.