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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,040 Posts1,055,478 Members48,424 | | 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 2008 Posts: 203 Shop Shark | | Shop Shark Joined: Apr 2008 Posts: 203 | Thanks much, Dave. I'll measure the diameter.
GMC's had a 12V system with the foot stompers. They had to make 12V starters for those early GMC's didn't they? Or did the early GMC engines not have 139 teeth?
Dave
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