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Harmonics or high frequency fatigue is present in all racing engines and will usually destroy the valve train if not controlled. Properly designed valve springs will control the dominant harmonics, provide the needed stability, and reduce valve train component wear.

Ferrea valve springs are developed from high strength alloys, including premium grade chrome silicone steel These springs are manufactured with state-of-the-art equipment. Ferrea 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 valve train combinations.

For Evo Model X.

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