Edelbrock part #9759 Valve Seal kit is a replacement valve seal kit for Edelbrock 390-428 FE Ford RPM Cylinder Heads with the current .562" seal mount diameter. These are hi-performance Viton seals with a steel body. This seal is designed for a 3/8 valve stem diameter and a .562" valve guide seal mount diameter. The compact steel body is compact enough to clear the inner diameter of most double w/damper racing valve springs.