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Click on image for the lowdown. 
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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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#94442 01/27/2006 2:53 AM | Joined: Aug 2005 Posts: 6,377 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,377 | Bill is correct. It's a graduated adjustment on the distributor that allows you to advance or retard the timing by as much as 6 deg. This was to allow the owner to adjust to the variable quality of gas available then. Here is the best pic I have but it isn't a good one. You can see the setup at the base of the distributor cap. If you look close you can see the adjusting knobs & the pointer. http://i47.photobucket.com/albums/f167/Tinys1938/Im001283.jpg
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