Ferrea Valve Spring Subaru Impreza

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