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The Brian Crower single spring and titanium retainer kit is specified for the Nissan QR25DE engine. Supplied as a valve spring upgrade kit, it pairs a single spring with a lightweight titanium retainer to support valvetrain stability and higher RPM durability. The listing identifies the QR25DE application so installers can confirm direct-fit use during cylinder head work.
Brian Crower Nissan QR25DE Single Spring & Titanium Retainer Kit
