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Click on image for the lowdown. 
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| | | Forums66 Topics128,211 Posts1,057,467 Members48,471 | | 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
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Sep 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | The Z series was 1954-1955 New Design GMC. Approximately analagous to Chevrolet Advance-Design 1954/55st. GMC differed from Chevrolet trucks in using a series letter rather than a year. What are the engine serial number and the engine/head date codes? Here is info on decoding the GMC truck serial number. | | |
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