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Rocker stud got loose, again

Rocker stud got loose. This is the second time it hapened. Thirst time it was an "intake" stud and now it was an "exhaust". Any ideas why this occurred?

AFD heads, solid flat tapped cam.650 lift, very, very low milage on engine.

Anyone out there knowing if there is any shaft mounted roller rockers that would fit these heads???

Confused
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