350cc Mod40/Early:CS1 SOHC 3/8" Stem Exhaust Valves (Sized - 4.590" Length, 1.635"\1.655" Head)

- High quality exhaust valves manufactured by G & S Valves - Following Head Sizes available (check your original) : 1.635" or 1.655". Standard Model 30\40 stem diameter : 3/8" - Valve Stem length: 4.590".

These valves have the standard SOHC exhaust 3/8" Valve diameter, with flat valve head (as normal for SOHC valves) - but have a smaller 1.635" or 1.655" diameter valve head - which were normally associated with standard Model 40 (350cc) valves.  The valve length is 4.590", withc collet groove cut, which is one of the most common lengths (and we also sell 350cc inlet valves of the same length).

However - these may also be suitable for some early CS1 engines, if fitted with smaller valves of this head size (but check your cylinder head, as well as existing valve length).  If these are too long, but the head size is suitable - we also sell a similar valve with blank stem, that can be cut by the customer to their desired length - see Item 0039C

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.

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