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There are two vents to the crankcase one for the PCV, which pulls a vacuum on the crankcase and the other which lets fresh (filtered) air into the crankcase. The PCV valve is hooked to manifold vacuum (usually at the base of the carb on carbed, duh, motors) and the other one is plumbed into the air cleaner housing NOT a vacuum source. :rolleyes:
 
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