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| | | Forums66 Topics128,076 Posts1,055,922 Members48,430 | | 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!
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| | | | Joined: Nov 2009 Posts: 26 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2009 Posts: 26 | Hey guys over the last year I have given this truck a complete tune-up and with your help rebuilt the brakes. Never really drove the truck til Saturday. I was giving her a test run when I stopped and noticed oil had blown out of the fill pipe. I cant find a pcv valve and was told that year did not have one. Any ideas where to start. I do see a tube that looks like it is running from the rear of the carb down the back of the engine. | | | | | Joined: Dec 2003 Posts: 2,733 Shop Shark | | Shop Shark Joined: Dec 2003 Posts: 2,733 | This is strickly a guess but that tube may be a vacuum line going to the brake booster or vacuum reservoir. Unfortunately I am of no help on the PCV valve but I'm sure many others can be. | | | | | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | Some of those had the pcv valve screwed into the back of the carb. Then had a hose that went to a cap on the outlet in back of the dis.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | | | | Joined: Nov 2009 Posts: 26 Wrench Fetcher | | Wrench Fetcher Joined: Nov 2009 Posts: 26 | Found the pcv valve behind carb last night. Still rattles when I shake it. Does this mean it is still good? Oil fill vent cap is very very gumed up. | | | | | Joined: Feb 2011 Posts: 14 New Guy | | New Guy Joined: Feb 2011 Posts: 14 | This is a physics problem:
The crank vent/fill pipe has positive pressure, the pcv line has negative pressure ... when one exceeds the other ... something's gotta blow.
Excess crank pressure from a "mature" engine is usually a ring/cylinder issue. Most likely the oil control ring(s).
The fix: hone / ring job
The cheap fix: Drain a quart, add a quart of Rislone get it hot and cross your fingers.
Otherwise: Hire it out for mosquito abatement.
-Hd | | |
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