Ferrea 1.225in to 1.570in Diameter 1.005/1.53 OD 0.73/1.11 ID Dual w/Damper Valve Spring - Single

The Ferrea S10009-1 is a set of dual valve springs designed to control harmonics and fatigue in racing engines. These springs are constructed from high-strength chrome silicon steel, heat-treated, and stress-relieved to enhance durability and lifespan. They offer stability for high-lift, high-rpm applications while minimizing load loss.

Each spring features a dual design with a damper, and the set includes specifications for outside diameter (1.005/1.53 inches), inside diameter (0.73/1.11 inches), seat pressure (135 lbs @ 1.875 inches), and open pressure (395 lbs @ 1.225 inches). The rate is 400 lbs per inch, with a coil bind of 1.160 inches and a maximum net lift of .650 inches. This product is universally applicable.