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Click on image for the lowdown. 
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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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| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
If it is a GMC engine, there is an engine serial number pressed into the block in the ledge/boss just to the rear of where the distributor goes into the block. The code may or may not have a letter or two at the beginning; the first 3 numbers would most likely be the displacement.
At the oldGMCtrucks.com link above, there is additional information regarding date codes and casting codes.
Tim
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