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I just noticed something. Look at the arrows in the pic, the surfaces are fretted and the dowel sleeve looks to be sheared off or missing.
The chain of events could have been:
1) Bolts holding the rocker stand work loose, oil flow to the lobe squirter is diminished / lost , cam lobe wears out. ( oil is fed from the small hole near the right hand bolt hole.
2) Cam wears for some reason, odd shaped lobe causes rapid acceleration of the valve / hammering , bolts work loose.
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