How do hydraulic flat tappet lifters fail?

toolmanmike said
I don't think one had anything to do with the other. Often times the lifters don't spin in their bores. If they don't there will be damage like you see. The bad thing, all that metal has ran through your engine and probably has caused more damage elsewhere.

Is there a way to ensure that they do spin, or is this just a thing that happens out of our control? And yes, I'm not looking forward to what I find when I pull it apart.

tonysrt said
I thought it was bad practice to fill lifter before installation. It becomes like a solid lifter and maybe valve hit piston creating damage.

I was wondering about that because I had found conflicting information before the install. The lifters are Comp Cam lifters, and the instructions said to soak them overnight.

**Edit** The lifters are Lunati that came with the cam/lifter kit, not Comp Cams lifters.