Pre 84 Trucks 1st gen pickups

Quick Vacuum Line Question on 20r

Old 04-16-2011, 12:15 PM
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Quick Vacuum Line Question on 20r

Where does line that is on the head in front of the PCV valve run to?? The one thats right behind the oil fill cap..? Thanks!
Old 04-16-2011, 03:44 PM
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there is a vent line on the top of the air cleaner lid .. goes to that


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Old 04-17-2011, 03:43 PM
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Im pretty sure you've got the wrong hole mixed up.. lol.. The pcv valve is the one that comes up closest to the firewall on top of the head correct?? Well I was wondering about the one that comes up closest to the oil cap.(I could possibly have my holes mixed up too.. lol). There isnt any type of check valve or anything on it.I have a 20r and recently installed Weber 32/36, I really want to get all my hoses right.. Thanks for ur help!

Last edited by YotaPirate07; 04-17-2011 at 03:45 PM.
Old 04-17-2011, 04:04 PM
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the one on the front is the intake side, the one to the back is the PCV.

you can see how it hooks up to the air cleaner in this pic of what was my stock calif version 20R

Old 06-15-2011, 10:39 AM
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I heard that hooking the pcv to the egr port on a weber is the way to handle the lack of pcv port when installing a weber carb on the 20r. Is that true? Also, after I did the install I noticed a small amount of oil in the air filter from the vacuum. I want to plug it, but need to take care of the pcv first so as to avoid blowing off the top.
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