| |
Click on image for the lowdown. 
====
| | | Forums66 Topics128,057 Posts1,055,816 Members48,426 | | 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: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | "0" is straight up factory timing.
"A" is advanced, usually 4 degrees
"R" is retarded, again often 4 degrees.
The advance can help compensate for a worn chain and gears but the racers are the ones that utilize the advanced or retarded cam for dialing in the power in the range they want it.
Evan
| | |
|
|
| |
