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Click on image for the lowdown. 
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| | | Forums66 Topics128,139 Posts1,056,756 Members48,454 | | Most Online14,466
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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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Nov 2002 Posts: 1,002 Shop Shark | | Shop Shark Joined: Nov 2002 Posts: 1,002 | The PCV valve is a one way valve. It allows the carb to suck the fumes out of the crank case keeping the bottom end clean. It blocks any backfire from the carb from igniting the fumes in your crank case, and blowing the pan off.
Larry
I don't own a vehicle that isn't old enough to drink.
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