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Click on image for the lowdown. 
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7 members (Uncles51, baldeagle, 1955 1 Series, 50Chevy3100, Gray_Ghost, Maybellene, 1 invisible),
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Global Mod,
Mod | | | Forums66 Topics128,026 Posts1,055,408 Members48,422 | | 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: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | GMC had a flat boss at the distributor with stamped numbers in those days. When you bought a new short block from GMC, it had the first 3 which was the displacement such as 270, 302 already stamped and the installer stamped the rest to match the title. When you installed a used engine, you simply ground the boss down and stamped numbers to match your title. | | |
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