See Figures 1, 2 and 3
The PCV valve is screwed into the carburetor or located in the ventilation hose on 1963 models. 1964 and 1965 models are not equipped with a PCV valve, but use a metered orifice fitting instead. This is not replaced, as it is a permanent part of the system, but it should be cleaned with solvent as a part of regular maintenance. The PCV valve is located in the hose or in the rocker cover on later models. Replace the PCV valve and if so equipped the PCV filter, located in the air cleaner, every 12,000 miles (1963-71), every 24,000 miles (1972-74), every 30,000 miles (1975-84).