These Supertech exhaust valves are specified for BMW S63 V8 32-valve engines and are listed as 29mm (standard) diameter, 5.95 stem and 106mm length, constructed from Inconel and sodium-filled, sold as a set of 16. The description provides the exact valve dimensions, material type and application for S63 engines; confirm compatibility with the target BMW engine before purchase.
Supertech BMW S63 V8 32v 29mm(std) x 5.95 x 106mm Inconel Sodium Filled Exhaust Valve - Set of 16