500cc SOHC 3/8" Stem Exhaust Valves - Various: (Sized - 4.565"\4.590" Length, 1.735\750" Head)

High quality exhaust valves manufactured by G & S Valves - Following Head Sizes available (check your original) : 1.735" or 1.750". Standard Model 30\40 stem diameter : 3/8" - Stem length: either 4.565" or 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. 4.565" is one of the shorter lengths available. If you have an original then measure that. If you are unsure please email me.