Running a properly operating PVC valve is a win-win situation, and it would be worth your time to investigate further. There have been a lot of malfunctioning PVC valves sold - including AC Delco brand.
A working PVC valve will shut off during periods of high vacuum, and the bad ones are allowing oil to be sucked out of the crankcase. Basically you should be able to blow one way without much restriction, but the valve should prevent you from blowing through from the other end. The bad valves I've seen maybe restrict only about 50% of the flow.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 Catalina Safari Wagon.
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