It circulates. The road draft tube pulls air out of the crankase & fresh air enters through the valve cover. 1963 & later used a PCV valve instead of the tube & 1968 up used a tube to the air cleaner instead of a vent on the valve cover.


They say money can't buy happiness. It can buy old Chevy trucks though. Same thing.
1972 Chevy c10 Cheyenne Super
In the Gallery Forum