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Mod | | | Forums66 Topics128,072 Posts1,055,903 Members48,429 | | 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!
| | THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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#73658 02/21/2007 8:58 AM | Joined: Mar 2005 Posts: 1,029 Member | | Member Joined: Mar 2005 Posts: 1,029 | Looks like an octane selector. Octane selectors were stock on Chevies from 1933 until near the last of the 216s. The engine is timed to factory specs with the octane selector at zero and initial timing can be advanced or retarded ten degrees depending on the octane of gasoline available. | | |
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