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The Supertech manganese-bronze valve guide for BMW M42, M50, S50, and S52 engines fits 6mm valve stems and has an outer diameter of 12.56mm for intake or exhaust use. This guide restores correct stem positioning and running clearance during cylinder head service, helping to preserve valve train geometry. Sold individually, it is specified where the 12.56mm OD matches the head bore for these BMW engines.
Supertech BMW M42/M50/S50/S52 Intake/Exhaust Valve Guide 6mm Stem 12.56mm OD
