Edelbrock part #5894 Sure Seat Valve Spring Kit is designed for Small-Block Chevy 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.