One of three things is happening, the rocker stud is pushing up from the head, if press-fit, or two, the interface between the lobe and lifter is starting to get excessive, or three, the locknut is loose. Adjust valves again according to cam manufacturer, and run engine again. Inspect again.
If you're using the stock locknuts and they don't seem (feel) to be tight about the stud, as in a locking nut, a fix would be to replace the nut(s).
Give a man a rescued dog for the health of both their souls. May 2017 ROTM Winner - Thank you!
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CUBS - 2016 World Series Champions - Thank you, Joe Madden Ö enjoy your next chapter.