As one can clearly see, the rocker stud has been eaten by the rockers.... This isn't the worst example. How long will it take to break one of these studs by the ROCKING action by the rockers? I'd guess there were 0,5mm missing from the stud, in a ring- shaped pattern around the circumference.
Also, the rocker have clearly touched the valve retainer. Although when thesting on the work bench, the clearence is 2-3 mm.
Hope the pics are shown this time.
RS