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Click on image for the lowdown. 
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| | | Forums66 Topics128,069 Posts1,055,884 Members48,428 | | 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
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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | I don't find that number in GMC books. Zenith was used in many industrial as well as military applications. Does it have the idle adjustment down low at 45 degrees or up higher horizontal. The horizontal is a 28 series, the 45 degree is a 228 series. | | |
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