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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.
The splayed-valve cylinder head has 240cc intake runners. The splayed-valve casting has a .240 minimum port wall thickness that permits extensive modifications by cylinder head specialist seeking even more airflow. The intake valves are angled 16 degrees to the deck surface and tilted (splayed) 4 degrees. The exhaust valves are 11 degrees, with a 4 degree tilt. This cylinder head has symmetrical intake and exhaust ports and can accommodate a 2.20 diameter intake valve and a 1.65 exhaust valve.