ON my car, I have a 302 engine with a carter 600 cfm carb, there is a pcv in the valve cover with the hose going to the big vacuum hook up in the front center of the carb. Would this be considered a closed system then? Also, on the other valve cover is a breather, which I remove to put the oil in. Does it matter what kind of breather is on that valve cover? Should that one be some kind of sealed cover instead of a breather? Will this cause any issues? Thanks.
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