Thanks. I did roll them as i took them out. All perfectly flatThat pushrod end looks machined, like it was made that way. Take all the pushrods out and roll them on a piece of glass (known flat surface). If they don't roll smooth, they are bent, and could be the cause of the noise. Remove the lifters ONE AT A TIME, and check. You'll know right away if one is the problem, it will be hard to remove. A bum lifter not pumping up or one that has flattened it's lobe will make noise as well.
As for the shape Thats the only one of the 8 on that side with the wear and only on top. All the rest are perfectly round top and bottom
Could it be a bad or frozen lifter? They all came out very easily