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the bearings are harder than your rocker shafts. ofcourse the shafts are going to wear. probably a bad heat treat on the rocker shaft. if the bearings are ok on the rockers, which they probably are. I would replace the shafts and move on.
I agree, not challenging.....any time you have a "focused" load, like small roller bearings with high valvespring pressure, the oiling requirments are of a thicker viscosity than a bushing that basically broadcasts its load but may have more drag. Good quality rocker shafts are what you need.
R.I.P.- Gary "Coop" Davis 02/09/68-05/13/04
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