Crankcase Ventilation Systems: Description
1961-67, except 1965-67 California models, incorporate an "open" type crankcase ventilation system. This system is a "Type 1" design. This system consists of an "open" breather cap, a hose running from rocker cover to carburetor throat and a ventilator valve located close to carburetor insulator fitting. The 1967 Eldorado series differs from the system described above. Instead of using an open breather cap, it uses a closed cap and has crankcase breather mounted on the left rocker arm cover. Fresh air to crankcase enters through this breather. The mounting of ventilator valve is also different as valve is installed in an elbow mounted to an oil separator, located on right rocker arm cover.