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I've personally never witnessed the oval'd wear you speak of, but it's probably a precursor to what I *have* observed on one rocker assembly in my spares pile. In this case, every rocker tip is clearly worn the width of the valve stem, to the point of having fingernail-catching ridges on at least one side of each worn area. Apparently many many miles, or improper oiling, or both.
But the assembly used in my "experiment" above has had a fairly recent rework of all the rocker tips... they are literally like new.
Gary L
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1971 142E ITB racer, 1973 1800ES, 2002 S60 T5
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