COMP cam magnum rocker nut failure

[Vegas69]

Your valve adjustment and what he is referring to are two different balls of wax. I'm assuming this is a hydraulic cam? Adjust the valve with the set screw loose, snug up the set screw, and then give the nut a hair more with a 9/16 wrench. If you are using a big ratchet or a super long wrench, you could over tighten the poly locks and crack them just as he said.