Take your Mazda MZR engine to the next level of performance with the Brian Crower Single Valve Spring and Titanium Retainer Kit. Built for high-rpm reliability and aggressive cam profiles, this kit is ideal for naturally aspirated or boosted builds running upgraded cams and tuning.

The BC1400 valve springs, made by PAC Racing, are crafted from premium chrome silicone alloy and engineered using proprietary heat treatment and stress relief processes to ensure consistent pressure and durability at extreme revs.

Matched with lightweight BC2400 titanium retainers, this combo delivers the ideal balance of strength and responsiveness, keeping your valvetrain in control even at elevated RPMs. With support for up to .480 (12.19mm) of net cam lift, this kit is perfect for aggressive setups that demand top-end stability.

Whether you’re running Stage 2 or Stage 3 camshafts, this spring and retainer kit ensures your MZR stays reliable and responsive throughout the rev range.