Edelbrock valve stem oil seal kit for early Ford FE cylinder heads uses seals sized for a .530" guide outer diameter and 3/8" valve stems. Supplied as a replacement kit, these seals are intended to prevent oil seepage down the valve guides on compatible Edelbrock FE heads. The set supports routine rebuilds where the original-style seal mount is used.
Edelbrock 16 Valve Seals - 3/8 Inch w/ 530 Guide