G&S Engine Valves for Triumph, Norton & BSA

Shop UK-made G&S inlet and exhaust valves for classic Triumph, Norton, and BSA motorcycles at The Bonneville Shop. Our selection includes replacement valves for selected Triumph twins and triples, BSA A50 and A65 twins, BSA A75 triples, and Norton 750 Commando and P11 inlet-valve applications. Compare model-year coverage, original part-number references, and G&S valve numbers to find the correct component for your cylinder-head rebuild.

G&S Engine Valves for Triumph, Norton & BSA

High quality valves made in the UK. Since 1946 G&S Valves Ltd has been manufacturing a wide variety of valves from OEM to prototypes. They handle the full process in-house, including forging, heat treatment, machining, and grinding, which gives them control over quality. Their technical material emphasizes durability under heat and stress, better anti-friction properties at the stem and guide, and improved resistance to wear and corrosion which is well suited to vintage British motorcycles.

British Engine-Valve Manufacturing Since 1946

G&S Valves was founded on July 13, 1946, by Harry Grenside and Ralph Saunders. Originally known as G&S Motors, the business operated from Milford, Surrey, before moving to purpose-built premises in Godalming in 1959 and adopting the G&S Valves name. Its manufacturing range subsequently expanded to include valves for competition engines and the British motorcycle industry.gsvalves

The company manufactures specialist engine valves and has facilities for forging, heat treatment, and machining. That manufacturing background provides context for the brand, but the correct valve for your motorcycle still depends on the specifications and application of the individual product.gsvalves

G&S Valves for Triumph Twins

Our Triumph twin-cylinder selection includes inlet and exhaust valves for several distinct applications:

• Triumph 500 T100, 1959–1966: inlet 70-4012 / V187 and exhaust 70-4013 / V188.
• Triumph 500 T100/TR5T, 1967–1974: inlet 70-6853 / V265 and exhaust 70-6854 / V266.
• Selected Triumph 650 models: inlet 70-3310 / V137, listed for 1954–1965, and exhaust 70-3927 / V138, listed for 1958–1965.
• Selected Triumph 650/750 applications, 1966–1983: inlet 70-4603 / V245 and exhaust 70-2904 / V24.

These are separate valve applications, not interchangeable options for every Triumph engine of the same capacity. Use the complete product listing and the parts information for your particular cylinder head when selecting replacements.

G&S Valves for BSA Twins & Triumph/BSA Triples

For BSA twins, our collection includes:

• BSA A50 500, 1966–1969: inlet 68-0661 / V255 and exhaust 68-0662 / V256.
• BSA A65 650: inlet 68-0665 / V253, listed for 1966–1972, and exhaust 68-0663 / V254, listed for 1964–1972.

For Triumph T150 and BSA A75 triples, we carry inlet 70-6422 / V270 and exhaust 70-6423 / V271 valves, listed for 1969–1972 applications. Check each listing against your motorcycle’s exact model and cylinder-head configuration before ordering.

Norton Commando & P11 Inlet Valves

Our G&S collection includes a UK-made inlet valve listed for Norton 750 Commando and P11 applications under part number 06-4034 / V263, with listed coverage of 1968–1972. Consult the individual product description for the intended application and available purchasing options.

The current collection displays this Norton inlet valve; it should not be treated as a complete inlet-and-exhaust range for every Norton engine.

G&S Valve & Kibblewhite Guide Set

For selected Triumph 650/750 applications, our range also includes a combined G&S valve and Kibblewhite bronze valve-guide set, listed for 1964–1978 under references 70-2904, 70-4603, and 71-3295 S.

This package combines components from two manufacturers: G&S supplies the valves, while Kibblewhite supplies the bronze guides. Review

How to Choose the Correct G&S Valve

Start with the exact engine and cylinder-head application, then compare:

• Motorcycle model and year.
• Inlet or exhaust position.
• Original valve part-number reference.
• G&S valve identification number.
• Product dimensions and specifications where supplied.
• Quantity included in the selected purchasing option.

Several products in this collection cover different year ranges for inlet and exhaust valves, even within the same motorcycle family. Check each valve separately rather than assuming that one application range applies to both.

If the cylinder head has been modified or replaced, establish which components it requires before ordering. A model name alone may not describe the parts currently fitted.

Shop G&S Motorcycle Engine Valves

Browse our G&S products below for UK-made inlet and exhaust valves and selected valve-and-guide packages. Review each listing’s application details and part-number references to select the components needed for your classic British motorcycle engine.

FAQ section