I found this for grinding seats in the block. Neat how the pilot locates in the guide bore and the lifter bore. I guess this is what you have?
https://www.youtube.com/watch?v=QDEJ3coQa14
I'm still curious about refacing the valves. The refacing tools I have seen look like this, with a collet chuck holding the stem. How is the flattie valve held with the mushroomed tip?
