Description Hardened valve spring seats keep valve springs from wearing into the head and center the inner and outer springs around the guide. Springs are raised .040″ above the surface of the head. Fits outer spring outer diameter 1.125 inch and inner spring inner diameter 0.585 inch. Fits Good Parts SKU 3078 valve spring set. Does not work with original dual valve springs which have the inner spring sitting on a 1/4″ high spacer.
