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In the video you will notice that the exhaust has the shaft rockers. I would assume it happens more on the exhaust so maybe heat.
Their is also another video that shows how he redisned the rockers with deeper grooves when he was having problems.
One theory.
If the lash is loose the lifter could leave its seat and fill with oil and then when the cam hits the rocker it slams the lifter down creating oil pressure that pushes the rocker off the pivot
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