I was replacing a leaking valve cover gasket today and also playing with the carb. I had the air cleaner off and the breather out of the valve cover. the engine was idling and I put my hand over the hole for the breather and noticed it had vacuum is this right?

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my first 6 1973 Plymouth Duster

That's good.

It means you don't have excessive blow-by, as the PCV system can handle what is produced.

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes

Ok that makes sense I did not even think about the PCV valve. Thank you.

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my first 6 1973 Plymouth Duster