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Click on image for the lowdown. 
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| | Forums66 Topics128,052 Posts1,055,729 Members48,426 | | 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!
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| | | Joined: Feb 2000 Posts: 5,201 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 5,201 | Hook up which ever port makes it idle the best. Ported or manifold vacuum act just the same once off idle, so it doesn't matter all that much. Manifold vacuum will have the port below the throttle shaft, ported vacuum will be above the throttle shaft. Vacuum advance add timing on top of what the mechanical adds. The design of the distributor is exactly the same no matter what vacuum source is used. Read this, https://www.crankshaftcoalition.com/wiki/images/e/e4/Vacuum_Advance_Specs.pdf | | |
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