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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Jan 2014 Posts: 3,690 'Bolter | | 'Bolter Joined: Jan 2014 Posts: 3,690 | If I had a downdraft tube with an oil fill cap on it, I would put a breathe cap on it as an inlet for fresh air for a PVC set up which would draw the fumes out of the engine via a PCV valve in the valve cover. I would of course need to block off the lower end of the downdraft tube.
I realize that this is backwards as to how the original PVC was setup for these engines, but I have always thought that the engineers had it backwards to begin with.
To be fair to the engineers back in the day, there were very few paved roads back when these trucks were new, so the location of a breather cap on a downdraft tube would not be drawing much "fresh" air that close to the dirt roads. I run mine kinda like that. Motorcycle-style breather clamped to bottom end of draft tube. PCV in the valve cover.
1951 3100
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