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The Supertech black nitrided exhaust valve set in +1mm oversize is intended for BMW S38 engines and supplied as a set of twelve. The black nitrided finish indicates a surface treatment applied to the valve, and the oversize dimension supports seat rework during rebuilds. Sold as direct-replacement exhaust valves for the specified S38 application to match dimensional and service requirements.
Supertech BMW S38 Black Nitrided Exhaust Valve - +1mm Oversize - Set of 12
