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I'm guessing whoever did the valve job just took a hammer to the valve guide and pounded away.
one way I learned to remove old guides is to get a drill bit a little smaller than the diameter of the guide and drill the guide out, but don't drill all the way through. Drill almost all the way through. After this is done, get a steel drift and insert into the drilled hole and then pound the guide out.
If you're really worried about the crack, the only thing you can do is grind it out and put a radius on the edge. Or get a new head.
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