Flat bottoms wouldn't be too hard to accomplish. Grinding to a radius would be a little more difficult. Knowing what radius to use could be helpful. I've read that the radius should be 100 inches, 50 inches, and some get more picky like 52". I've got one more local source that I haven't been able to contact. He runs a two-man shop but probably does more volume than all of the other shops in the area combined. For that reason, he is really hard to reach by phone. He gets all of the race car business in the area. If anyone around here can do it, he can.
The lobe where the worn lifter was located doesn't show any more wear than the other lobes. That lobe lift was 0.220 which was right in the middle of the .219 -.221 range. The damaged lifter shows a slight "keyway" worn into its face because it wasn't rotating. I can't see any more wear on that lobe but I don't have any method here at the house of checking duration, etc.
