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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | 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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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jan 2011 Posts: 159 Wrench Fetcher | | Wrench Fetcher Joined: Jan 2011 Posts: 159 | I answered my own question. Thanks! | | | | | Joined: Jan 2008 Posts: 4,960 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,960 | I'm not sure I understand your question. The scale is the octane selector. It was meant to be set at 0 and then timed by loosening the horizontal screw and turning the distributor to the desired timing. You can then advance and retard it to compensate for octane and altitude and come back to your starting point. | | |
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