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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.
Most shops specify 0.060- to 0.080-inch seat width for the exhaust side. The position of the valve seat in the head is also important. Each time the valve seat is machined, >> material is removed and the seat âsinksâ into the head, moving deeper into the port.