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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Mar 2010 Posts: 10,275 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,275 | It is important to cover all of the bases when designing a custom PCV system, especially when drawing vacuum from the draft tube (virtually directly from the crankcase).
More modern PCV systems do not pull directly from the crankcase. They pull from the valve cover. There is a lot of oil splashing around in the crankcase making it a less-than-ideal place from which to draw vacuum.
Another factor to consider is what size orifice to use to prevent too much applied vacuum.
Another factor is to determine when is the ideal time to do the majority of the purging of crankcase contaminants. Modern PCV systems take this into account.
I don't have a PCV system on my Stovebolt engine. I religiously change my oil every 3,000 miles.
Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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