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Click on image for the lowdown. 
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| | | Forums66 Topics128,260 Posts1,058,288 Members48,485 | | 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!
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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: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | Larry, 1959 6-cylinder octane selector That might be a car's adapter (they show a car adapter in earlier manuals). As posted above, this allowed for "temporary" adjustments due to using different brands/grades of gas, and also when driving at different altitudes. | | |
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