[Spridgets] Engine Breathing

[Robert E. Shlafer]

Hi, John...

your intake manifold PCV valve contains a  "graduated orifice" or port of a specific size venting crankcase gasses (pressures)
"outbound".

In order to work correctly, it requires an
"inbound" port (as above), which is normally the stock 'filtered' oil cap.

Simply "cap" the valve cover "takeoff" port which, in later emissions cars WAS the inbound "graduated orifice" for crankcase intake air from a 'carbon cannister'.

In  pre-emissions applications ('open'
crankcase) this valve cover takeoff had a far larger opening (1/2" or so) for venting crankcase gasses to one of the air cleaners.

Cap'n. Bob      '60 :{)