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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.
Then you can set the lash on the valves by the specs listed in your camshaft spec card that came with the camshaft. Spin the intake rocker nut down with the correct thickness feeler gauge inserted between the valve stem and the tip of the rocker arm.onclusion. Setting valve lash may be intimidating for the average Joe, but talking with top engine builders, valve lash is a simple and basic maintenance procedure that when done with a purpose, is a walk in the park.