Marlin,
the pcv system constantly removes a small amount of the vapors collecting in your crankcase and replaces them with fesh air. the vapors are the partial by products of combustion. when the manufacturers adopted the pcv system back in the '60s, engine longevity was greatly enhanced, engine wear over time was reduced by a very big factor, something like 1/10th of what it had been. I STRONGLY recommend all non-competitive engines should utilize a pcv system.
George
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