Edelbrock part #5824 Sure Seat Valve Spring Kit are replacement valve springs for early E-Street Cylinder heads with 1.250" dia. Valve springs. Made of highest quality spring wire and precision wound to close tolerances. 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: 1.750" Outside diameter: 1.250" Open Pressure: 325 lbs. @ 0.550" Coil Bind: 1.150"