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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.
There are some fittings made which can be screwed onto either a 37Â° or a 45Â° fitting. The dual angle flare seat is apparent. Obviously, this is a kind of bastard fitting, and should not be selected as a primary style in the design of any hydraulic system, though they surely come in handy at times.