Edelbrock part #5895 Sure Seat Valve Spring Kit is designed for Big-Block Chevy 396-402-427-454 V8 engines with O.E Cast Iron Heads. Made of highest quality spring wire and precision wound to close tolerances. This Sure Seat Valve Spring set is for use on original equipment heads when installing Edelbrock Performer-Plus camshafts. The valve springs are supplied with retainers and lock kit. For camshaft warranty compliance, use only the springs recommended by Edelbrock for each camshaft application. Set of 16. Valve Spring Specifications: Type: Non-Rotator Seat Pressure: 90 lbs. Installed Height: 1.880" Open Pressure: 220 lbs. @ 0.420" Outside Diameter: 1.500" Inside Diameter: 1.082" Coil Bind: 1.340"