Description
This a is a Manganese Silicon Bronze Valve Guide Set (8) for the Triumph TR2, Triumph TR3, Triumph TR4 to CT21470 for customers wanting to update to the smaller valve stem exhaust valve that came in the later Triumph TR4. The advantage of upgrading to the 5/16 valve stem is the valve does not hold as much heat as the 3/8 valve, plus you will also benefit from improved flow around a smaller valve stem. Dimensions for the intake guides are .500 outside diameter with a 5/16 stem and the exhaust guide with outside diameter .535 and inside diameter of 5/16. Why choose a Manganese Silicon Bronze Valve guide; The Bronze has the amazing ability to self lubricate plus the Bronze provides superior heat transfer and resists seizing compared to standard Cast Iron Valve Guides. Rebuild your Cylinder Head once with High Quality Manganese Silicon Bronze Valve Guide.