D1OZ-6A664-B Original used hose that connects the valve cover mounted PCV valve and the carburetor spacer plate on 1971 through 1972 Mercury Cougar and Ford Mustang 351C or Cleveland engines only. Used hoses will have faded striping (if present), and clamp impressions. Very often the rubber will be hard and showing some degree of stress cracks.
*Note - Excludes all 1969-71 351W or Windsor engines, 1970 351C or Cleveland, and 1973 351C engines.
*Note - These molded and contoured hoses were designed to work with original style PCV valve (modern 90° PCV valves won't work). Additionally anything other than period original intake manifolds, valve covers, and spacer plates can also alter the position and distance in the relationship of the PCV valve and carburetor spacer plate.