C9ZZ-6A664-A Used before 02/21/1969 Original used hose that connects the original threaded PCV valve combination with C7OZ-6A706-A elbow to the carburetor spacer plate. All early 1969 S code 390-4V engines. Molded hose with 5/8" valve end and 1/2" spacer plate end. 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 - These molded and contoured hoses were designed to work with an original style PCV valve with a threaded brass 90° elbow with flared fitting. 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.