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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 2014 Posts: 4,483 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,483 | I think that was the PCV connection, and it possibly had a T that fed into power brake booster. If you know what year the manifold came from, you can look at the GM Heritage documents and probably find the vacuum network. Around 1973 EGR started and it could have been connected with that, also.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
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