Description
This is a Larger than stock Exhaust Valve (1.425 or 36mm) for the Triumph TR3,TR4 and TR4A These valves are made from a 214N Stainless and have the Gasflow design which improves flow compared to the stock valve. For the valve stem size of the Large exhaust valve for the Triumph TR3, TR4, TR4A is 5/16, if you have a Triumph TR2 TR3 TR3A TR3B TR4 to CT21470E you will need to purchase the 3/8 to 5/16 valve guide conversion. For even more gains be sure to also install the matching intake valve on your Triumph TR3, TR4 and TR4A. Cross Reference TT1135.
