This Supertech black-nitrided exhaust valve set fits BMW M50, M52, S50 and S52 engines and is supplied as a pack of 12 valves. The nitrided finish is indicated in the source and the set provides a like-for-like exhaust valve option sized for those BMW straight-six cylinder heads for routine valve replacement or rebuild work.
Supertech BMW M50/M52/S50/S52 Black Nitrided Exhaust Valve - Set of 12