Brian Crower Valve Spring & Steel Retainer Kit for Mazda MZR

Brian Crower Valve Spring & Steel Retainer Kit for Mazda MZR Brian Crower valve spring and steel retainer kit is engineered for Mazda MZR engines to deliver improved valvetrain stability, durability, and high-rpm reliability. Ideal for street, track, and performance builds, this kit replaces fragile OEM components with race-proven hardware. Durable steel retainers — precision-machined for consistent fitment and reduced wear. High-performance valve springs — calibrated for increased seat pressure and superior control at elevated RPMs. Direct fit — designed specifically for Mazda MZR cylinder heads for simple installation without modification. Improved reliability — prevents valve float and keeps valvetrain geometry stable under demanding conditions. Complete kit — includes springs, retainers, locks, and necessary hardware to rebuild each valve assembly. Upgrade your Mazda MZR with Brian Crower’s precision components to gain confidence on the road or track. The kit supports aggressive cam profiles and higher RPM operation while maintaining OEM-style fitment and serviceability.