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Click on image for the lowdown. 
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| | | Forums66 Topics128,057 Posts1,055,815 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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| | | | Joined: Sep 2008 Posts: 872 Shop Shark | | Shop Shark Joined: Sep 2008 Posts: 872 | Looks like an eccentric screw.... would allow you to change the timing of the vacuum advance. It probably has about 1/16thin total swing.. that would add or reduce the effect of the advance by shortening or lengthening the effective arm of the advance giving you more or less degrees timing.
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