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Click on image for the lowdown. 
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8 members (ronsway, KEVINSKI, Otto Skorzeny, Greg_H, 1955 1 Series, TrknGMC, TooMany2count, Peggy M),
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Global Mod,
Mod | | | Forums66 Topics128,142 Posts1,056,481 Members48,441 | | 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!
| | | | Joined: Dec 2001 Posts: 1,248 'Bolter | | 'Bolter Joined: Dec 2001 Posts: 1,248 | It is mostly to adjust how much advance is in the timing...
The higher the octane fuel used the more the timing could be advanced.
John | | |
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