Valve Intake Large 41mm TR3, TR4, TR4A

This is a Larger than stock Intake Valve (1.615 or 41mm) for theTriumph 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 intake valve for the Triumph Tr3, TR4, TR4A it is the same as stock, 5/16, so no modifications will be needed for the valve guide.For even more gains be sure to also install the matching exhaust valve on your Triumph TR3, TR4 and TR4A.