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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.
From there a coating of blue dye is applied to the valve face. Now the valve stem will be inserted into the guide, and the valve depressed until its face firmly contacts the seat. Once the face and seat are in contact, you will apply a slight amount of pressure, and rotate the valve one quarter turn in its seat.