BMW B46 Valve Spring Kit by Ferrea

When building a high-performance BMW B46 engine, upgrading the valvetrain is critical—and Ferrea valve springs are among the most trusted components in the industry. Engineered to prevent binding, breakage, and valve float, this spring kit is designed for enthusiasts pushing their B46 on the street or track. Built to Handle High RPM and Boosted Applications Valve spring binding, breakage, and float can cause major problems at high RPM or under boost. Ferrea valve springs are heat-treated and stress-relieved to maintain strength and stability even under extreme conditions. Whether you're running a big turbo or spinning the B46 to its upper RPM range, these springs help ensure reliable valve operation and protect your investment. No Binding: Prevents valves from sticking during lift cycles. No Breakage: High-strength materials resist failure under load. No Valve Float: Maintains proper valve control at high RPMs. High-Strength Retainers and Spring Seats Ferrea’s CNC-machined retainers are designed for high lift and high stress, offering superior durability over factory components. Paired with 4140 chromoly spring seat locators featuring a hard nitrided surface, this setup ensures consistent seat pressure and long-term reliability—key for engines seeing repeated high-RPM use. The Right Choice for Performance Builds Factory B46 valve springs are not built for aggressive cams, high RPM, or forced induction. Ferrea’s spring kit is purpose-built for increased seat and open pressures, helping to maximize power while reducing the risk of valvetrain damage. Note: Installation requires the expertise of a professional engine builder to measure installed heights, check coil bind, and set proper spring pressures for your build.