Rocker problems

Hi. A couple of my roller tip rockers bushings have failed on the axel with big çlearences. Engine 340 is nearly stock with a bit hotter cam and springs. I have NOT done any oiling mods. Oil is coming when the camholes line up and i pump with electrical drill. Should i have done the groove in nr 2 and 4 camjournal? Not a race engine.
Johan.

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