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

The Ferrea Racing S10025-1 is a dual valve spring designed to control harmonics and fatigue in racing engines. It is constructed from premium grade chrome silicon steel, heat-treated and stress-relieved for increased durability.

This valve spring provides stability for high lift, high RPM racing engines while minimizing load loss. It features diameters ranging from 1.225 to 1.570 inches, with outside diameters of 1.005/1.53 inches and inside diameters of 0.73/1.11 inches. The spring specifications include a seat pressure of 140 lbs @ 1.900 inches and an open pressure of 430 lbs @ 1.250 inches, with a rate of 440 lbs per inch and a coil bind at 1.170 inches, supporting a maximum net lift of .650 inches.