[Bob In Ct]

As Elmer Fudd said "be vewy wewy caweful". PCV valves allow (extra) air to enter into the intake manifold. This causes the air/fuel mixture to lean-out. Don't just assume that all PCV valves are created equal. The valve on your 74 Fairmont was designed to be there. You may cook your valves and pistons in an effort to circulate some fresh air through your crankcase.

The PCV valve was one of the first anti pollution devices. It was not invented to reduce pressure or circulate lots of fresh air through your crankcase as some have said. It was designed to burn crankcase gases that at the time were just vented to the street through a tube under the car. Believe me, I was there.

Bob