Edelbrock part #5769 Valve Spring Seat Cups for Edelbrock S/B Chevy, 289-351W Ford, 318-360 Chrysler and Pontiac heads using #5767/#5825/#5845 valve springs. These Spring cups provide a hardened barrier between the springs and the aluminum heads, positively locating the base of the spring to prevent unwanted spring movement. Set of 16.