350cc SOHC 3/8" Stem Exhaust Valves (Sized - 4.590" Length, 1.635\655" Head)

- Highest quality exhaust valves manufactured by G & S Valves. - Following Head Sizes available (check your original) : 1.635" or 1.655" (please state which head size when ordering). - standard Model 30\40 stem diameter : 3/8" - Stem length: 4.590", these valves already have the collet groove machined and are ready to fit. Note: Norton cammy valves were made in a variety of lengths over the years, however, this length - 4.590" is one of the most commonly used. If you have an original then measure that. If you are unsure please email me