Ferrea Dual Valve Springs (SINGLE) - BMW / M50 / M51 / M52 / M54 / S50 / S52

Ferrea Valve Springs are developed from high strength alloys, including premium grade chrome silicon steel. These springs are manufactured with state-of-the-art equipment. Our springs are heat-treated and stress relieved, which dramatically increases the spring’s life.


Strict quality control procedures and cycle testing ensures consistency from batch to batch. Ferrea Valve Springs provide the stability needed for high lift, high rpm racing engines, while minimizing the load loss for today’s aggressive valvetrain combinations.



- Outside Diameter: 22.75 mm/29.5 mm
- Inside Diameter: 17.1 mm/22.75 mm
- Seat Pressure: 80 lbs @ 36mm
- Open Pressure: 180 lbs @ 26 mm
- Rate Inch: 254 lbs
- Coil Bind: 21 mm
- Max Net Lift: 14 mm


This Spring requires Ferrea Titanium Retainer #E11025 and Ferrea Spring Seat Locator #SL1021 (Discard OEM Spring Seat Locator).



Replaces OEM Part #  11-34-7-504-268 / 11 34 7 504 268 / 11347504268