Comp Cams stainless rocker question

hi, I do my own banana grooving on my shafts. you need a very thin cut off wheel, about 2" dia, mounted on a air die grinder, very carefully cut a small groove. it doesn't need to be deep. use low air pressure so you can have control of tool. go out enough to cover most of rocker area, do not go past . the original rocker shafts, had an oil hole on the back side also. the original 273 rocker had no groove in them. the comp rockers do have a groove.
i've used this homemade grooved shaft on a 340, turning 7000 rpm, have never had gauling or spalling. after grooving shaft, take 400 grit and wd 40, sand the shafts.