Rocker bolt washer/spacer
Those fasteners will pull the aluminum threads out the head before you stretch them.
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If pushrods length was set correctly and engine ran correctly for years, they don't need to be re-adjusted.
If you have any new valvetrain noise not present before, it could be a lifter going bad (discharging too quick?) and cause loose rocker or if you over revved your engine, maybe bent pushrod.
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