Thread: What would cause this lifter failure (pics attached)

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I partially took apart the lifters at my desk. They are 2 piston style. The first piston came out easily, but it looks as if there is galling on the inside walls (which would have prevented the lifter from properly compressing. I'll take them the rest of the way apart at lunch and see what I find. The engine was running before all of this happened. I took the engine out of my friends Jeep and then into mine. At that time, I looked at all the lifters and they looked good. Then soon after, the rocker became loose and rattly. I think I got a few of them dirty, quickly causing the intial failure of the rockers and likely cam damage (no question there). I'll be taking the cam out tonight or tomorrow night.

I have been regularly changing the oil, and will again with this cam change. I WILL degree the cam and break it in proper with Shell Rotella. I wonder if I could have burnt a few valves if the lifters were acting solid and I tightened 1/2 turn past?? I really don't wanna take the head off.

I have a new cam and lifter set (lunati) on my table. The spring force is 132lbs (see picture of the specs).