Supertech B48 Valve Guides for Gen 3 F54 F55 F56 F57 F60 Cooper S with 4 Cylinder B48 engine.
These Supertech valve guides are manufactured from high quality Manganese Bronze for sport compact and domestic applications.
For exhaust valve guides designed to be used for high powered engines that need a better thermal transfer coefficient, we use a copper alloy guide. Copper has about a 3x higher thermal transfer rate than manganese bronze.
Sold as a set of 8 intake or exhaust, or set of 16 complete
