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Supertech dual valve spring kit tailored for BMW S42, M42, M50, S50, M52 and M54 engines, intended to upgrade valvetrain spring capacity and stability. The kit supplies matched dual springs and is offered to support rebuilds or performance-oriented valvetrain refreshes on the listed engine families without expanding beyond the explicit engine model coverage provided.
Supertech BMW S42/M42/M50/S50/M52/M54 Dual Valve Spring Kit
