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.
Product description
G&S Valves are precision-forged engine valves manufactured in the UK from high-grade valve steels, designed to deliver exceptional reliability and performance in demanding combustion engines. Each valve starts life as a plain steel rod that is electrically upset, close‑limit forged, and then meticulously machined, ground, heat treated and plasma treated in-house to achieve optimum strength, hardness and wear resistance. This end‑to‑end control of the process allows G&S to offer valves that maintain stability at extreme temperatures and engine speeds, making them ideal for everything from vintage road engines to top‑tier race motors.
As the only British manufacturer dedicated to these specialist valve components, G&S Valves supply many major OEM and high-performance engine builders, including Cosworth, Rolls‑Royce Motor Cars, Varity Perkins and numerous vintage car and motorcycle clubs. Their products have seen success at every level of motorsport—F1, Le Mans, IndyCar, sports car and club racing—demonstrating a proven track record under competition conditions. For classic and vintage enthusiasts, G&S also produce correctly specified replacements, such as side‑valve Norton engine valves that match original dimensions and accept standard hardware while offering superior modern materials and finish.
We carry both inlet and exhaust valves for Triumph, Norton and BSA motorcycles including:
- 1959-1966 Triumph 500
- 1967-1970 Triumph 500 T100
- 1954-1965 Triumph 500 and 650
- 1963-1970 Triumph 650 and 750
- 1969-1974 Triumph T150 750
- 1968-1972 Norton 750 Commando
- 1966-1969 BSA A50 500
- 1966-1972 BSA A65 650
BSA 500 A50 Exhaust Valve G&S UK-Made 1966-1969 PN# 68-0662 GS V256
$48.43 – $92.73Price range: $48.43 through $92.73
BSA 500 A50 Inlet Valve G&S UK-Made 1966-1969 PN# 68-0661 GS V255
$44.15 – $84.36Price range: $44.15 through $84.36
Triumph 750 T150 BSA A75 Exhaust Valve G&S UK-Made 1969-1972 PN# 70-6423 GS E6423 V271
$49.14 – $140.00Price range: $49.14 through $140.00
Triumph 750 T150 BSA A75 Inlet Valve G&S UK-Made 1969-1972 PN# 70-6422 GS E6422 V270
$49.14 – $135.04Price range: $49.14 through $135.04
Triumph 500 T100 Exhaust Valve G&S UK-Made 1959-1966 PN# 70-4013 GS E4013 V188
$48.43 – $152.12Price range: $48.43 through $152.12
Triumph 500 T100 Inlet Valve G&S UK-Made 1959-1966 PN# 70-4012 GS E4012 V187
$44.15 – $151.38Price range: $44.15 through $151.38
Triumph 650 6T TR6 T110 T120 Inlet Valve G&S UK-Made 1954-1965 PN# 70-3310 GS E3310 V137
$44.15 – $84.36Price range: $44.15 through $84.36
Triumph 650 6T TR6 T110 T120 Exhaust Valve G&S UK-Made 1958-1965 PN# 70-3927 GS E3927 V138
$48.43 – $140.00Price range: $48.43 through $140.00
Norton 750 Commando P11 Exhaust Valve G&S UK-Made 1968-1972 PN# 06-3282 V264
$5.00 – $10.00Price range: $5.00 through $10.00
Norton 750 Commando P11 Inlet Valve G&S UK-Made 1968-1972 PN# 06-4034 V263
$44.15 – $100.78Price range: $44.15 through $100.78
BSA 650 A65 Inlet Valve G&S UK-Made 1966-1972 PN# 68-0665 GS V253
$44.15 – $84.36Price range: $44.15 through $84.36
BSA 650 A65 Exhaust Valve G&S UK-Made 1964-1972 PN# 68-0663 GS V254
$48.43 – $92.73Price range: $48.43 through $92.73
Triumph 500 T100 TR5T Exhaust Valve G&S UK-Made 1967-1974 PN# 70-6854 GS E6854 V266
$48.43 – $152.12Price range: $48.43 through $152.12
Triumph 500 T100 TR5T Inlet Valve G&S UK-Made 1967-1974 PN# 70-6853 GS E6853 V265
$44.15 – $151.38Price range: $44.15 through $151.38
Triumph 650 750 Exhaust Valve G&S UK-Made 1966-1983 PN#70-2904 GS UK-Made E2904 V24
$48.43 – $140.00Price range: $48.43 through $140.00
Triumph 650 750 Inlet Valve G&S UK-Made 1966-1983 PN# 70-4603 GS UK-Made E4603 V245
$44.15 – $100.78Price range: $44.15 through $100.78