At WOT valve cover breathers vents crankcase gases to the atmosphere (open PCV system) while the valve cover tube (closed PCV system) vents the same gases to the air cleaner for combustion.
At idle and cruising speeds the air goes into the crankcase thru the breather or tube.
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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