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The PVC is a controlled vacuum leak. At idle, vacuum is high (theoretically) and should keep the ball closed. When you mash the throttle, vacuum drops and the ball goes loose. This is where most of the blow by/crankcase pressurization occurs and forces this stuff up the valve covers and back into the intake. When the engine is off (no vacuum) the ball should rattle around.



I think this is incorrect. The PCV is a controlled vacuum leak. However it is not held closed by vacuum. It's closed by pressure on the carb side that seats the check ball. That's to stop a backfire from going into the crankcase if memory serves right. Either vacuum from the carb, or pressure from the crankcase will un-seat the ball. The only reason to remove it is when there is very low idle vacuum or for cylinder to cylinder tuning(balancing). Breathers alone typically do not stay dry. The vapor condenses and fills the filter media in the breathers then runs out and gets blown all over.

Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.