Grinding seats is not that messy. Lots of rags in areas you want to protect. Some of the older manuals will show a cutter to reface the seats, but for the last 70 years or so they are done with specially designed grinding stones. Seems like we rarely to never need them for the modern engines, since the computer keeps everything so clean and the fuel mixture just right. I bought a complete valve grind set-up because I have more old engines than new ones.
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