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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
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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2000 Posts: 114 Member | | Member Joined: Sep 2000 Posts: 114 | Check this picture: http://1929to1954chevy.web1000.com/02/154.htm The arm (2.418) has a scale on it. The octane selector was used to make small adjustments to the timing to account for variations (varying quality) of the available pump gasoline. Jim
Jim
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