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By definition a closed system must have the PCV mounted in one valve cover and attached to the intake manifold vacuum while a closed breather cap from the opposite cover has a draw upon it from the intake system through an emmisions rated hose (not something like heater hose) and attached to the base of a closed air filter.
Earlier requirements did not require PCV with Webers.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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