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Valve Jobs Done Right. A close-up of a Honda CB750 SOHC valve seat. Though the upper 30 degree and the lower 60 degree shapes have been rough cut using Neway cutters, the 45 degree cut in the middle, the one that counts because it is the actual sealing surface, has the benefit of a stoned surface, the best possible with hand tools. Ah, valve jobs.
A pilot shaft is fit into the valve guide in order to achieve a center axis for the seat cutting tool. The actual cutting tool can be a grinding stone, multiple blade carbide, or a multi-angle single blade cutter; with the newest design being a single cutting point that is computer controlled to cut the angles.