Ferrea 1.225in to 1.570in Dia 0.925/1.24 OD 0.66/0.915 ID Dual w/Damper Valve Spring - Single

The Ferrea S10008-1 is a set of 16 dual valve springs with dampers, designed for high-lift, high-RPM racing engines. These springs are constructed from premium grade chrome silicon steel, then heat-treated and stress-relieved to enhance durability and lifespan.

The springs offer a diameter range of 1.225 to 1.570 inches, with outside diameters of 1.005/1.43 and inside diameters of 0.725/1.07. They provide a seat pressure of 170 lbs at 1.830 inches and an open pressure of 368 lbs at 1.210 inches, with a rate of 320 lbs per inch and a coil bind height of 1.110 inches. The maximum net lift is .620 inches.