i saw one years ago on a plymouth flat head 6 and the guy said it improved preformance. ??
Hmmmm- - - - -is that guy available to talk to my garden? It's about time for another application of fertilizer! PCV is just a way of dealing with vapors in the crankcase without venting them to the outside atmosphere. A crankcase is going to have a certain amount of combustion gas blowby, oil vapors, and other contaminants anytime the engine is running, so it's got to be vented or pressure will build up and blow oil out past all the gaskets and seals. One way to handle the problem is to create a positive flow of air through the crankcase and into the intake manifold with a pulsating valve that prevents too much vacuum loss. That's all the PCV valve does- - - -it just takes little gulps of air out of the crankcase as the manifold vacuum fluctuates. It doesn't help or hinder performance.
Jerry
