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Click on image for the lowdown. 
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| | | Forums66 Topics128,031 Posts1,055,434 Members48,422 | | 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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| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | The vacuum advance moves the internal parts of the distributor, the outside doesn't move. ??? The vacuum advance unit on a 216/235/261 is attached to the outside of the distributor - you can see the distributor move. The mechanical advance mechanism (weights/springs) are inside the distributor and you cannot see them at work. | | |
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