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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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| | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | There should be a 1/4"-20 x 2" screw in the clamp portion of the advance. That is what locks the dizzy down once base timing is set. The advance itself is locked to the block by the bolt in the slotted hole for the "octane selector" part of the advance. Here's a pic from the manual.
Bill Burmeister
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