I have seen this on a number of heads. The springs put side pressure on the rockers and they eventually wear into the sides of the supports. I face off the damaged areas and use shims to put everything back to center. I made a jig for refacing the arms but you can take them to any automotive machine shop and they can reface them. I believe the surfaces are only case hardened and will not be hard after removing the material needed but who cares unless this tractor is going into full time farming. Go to http://albums.photo.epson.com/j/AlbumList?u=4045430 in the "Maynard" and "Super C" albums and you will find photos of finished heads, look close and you can see the shims.
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Today's Featured Article - Magic Moments - by Tyler J. Woods. Magic moments don’t just happen. You have to help them along. This morning, I got up early. It is my day off from my regular workweek and I had a lot of things to do. It’s fall, and with winter coming on, there is a lot of work to do before weather closes in.
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