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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: 4,509 Moderator, Electrical Bay | | Moderator, Electrical Bay Joined: Mar 2014 Posts: 4,509 | Hi Frank, At idle there will be no vacuum present for the vacuum advance. The vacuum port is located where it will only work when the carburetor is in the "off-idle" and running modes. There will be a very small amount of mechanical advance present at idle...which will increase as the speed increases. Hope this is helpful.
~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
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