C8OF-9600-B For all 1968 S code 390-4V engines, regardless of GT or 6.5 badges. About 17.00" inches in diameter. Unique feature on this base is the addition of a round vacuum operated valve on the drivers side. Ford part number C8OZ-9600-B. Our grade B base may have extra holes drilled, possibly dents or rust. Call for details on exact blemishes. Current base is missing the round vacuum valve completely.