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The Supertech dual valve spring kit for BMW S42, M42, M50, S50, M52 and M54 engines is a matched set of dual springs that help control valve motion and maintain consistent valvetrain operation. Supplied as a direct-fit replacement for the specified engines, the kit is intended to refresh valvetrain components during rebuilds or cam upgrades and restore reliable valve seating across the RPM range.
Supertech BMW S42/M42/M50/S50/M52/M54 Dual Valve Spring Kit
