PCV???? Race vacuum pump? At the car show Saturday night I saw this “race” engine BBC. The valve covers were completely sealed, no access caps for oil or pvc valve. However, going to the valve cover that would normally have a pvc valve on it was a hose, attached to a filter, attached to a pump. I asked the owner what that was for and he second it gives the engine more vacuum. He said the pump only takes about 1hp to run, but the benefits outweigh the lack of 1 hp. Two questions for a novice: What does a PVC valve do? What’s the benefit to his setup?