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BTW this is NOT required in California. Any year of Packard is old enough to be except from emission control. Kind of like seatbelts, if it didn't come from the factory with it, then it's not required.
Kev, You are probably not old enough the know this but In the early 60's when all this clean air crap was getting started California did require a PVC valve be installed on every car. They would cram a rubber plug up the breather tube and cut a hole in one of the valve covers (don't know what they did with a flat head) and run a line from there to the air cleaner. Of course the PVC valve was in that line. Don't remember how they plugged off the oil filler tube. Probably used a non vented cap of some sort.
I remember this was death to an old motor. All that oil blow by would gum up the carb and make a mess in the combustion chamber. I remember my Mom's old 1950 Cad after the PVC instillation. The system sucked the crank case dry on a short trip from Pleasant Hill to Oakland some 26 miles. Almost lost the motor all together. Remember my Dad pulling the plug after that.
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