Crankcase Ventilation Systems: Description

All 1966-67 non-California cars used an "open" crankcase ventilation system "Type 1". On 6 Cyl. engines the open system receives its outside air through a filtered oil filler cap. On V8 models the open system receives intake air through a breather on the valve cover. The remainder of the system is the same for both V8 and 6 Cyl. models. This "open" system consists of a valve controlled by intake manifold vacuum, appropriate hose connections between crankcase and intake manifold, unmodified crankcase breather cap on 6 Cyl. engines and a plugged breather cap on V8 engines.