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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: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | You set the octane selector to zero before adjusting the timing. The octane selector was useful when you bought different grades of gasoline and/or you were driving at different altitudes. You could fiddle with the octane selector and later set it back to 0 when you got home.
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