Lifter Failure
No amount of prelube or breakin will help when the lifters are machined like this. The one on the left has been remachined, the 2 on the right were put in the machine with a very light touch off pass, you can see the radius is off center. It's like the lifter body was chucked crooked. Most are that way right out of the box. That's why they fail in my opinion.
