That's the factory PCV system, and it is pretty rare and nice to have. They were stock on COE's and available as options on all engines.
The stock PCV on my GMC 302 looks similar but the valve body mounts to the intake manifold and the breather tube has a little paper element air filter in the body and a filler cap for the oil- the valve cover does not have a filler cap.
Last edited by 4ontheFloor; 01/06/2008 10:35 AM.
