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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!
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For helping keep this great
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| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Dave, Thank you for your post. It confirms what I had thought was the case on blocks/heads but I have no supporting documentation. 41Chevy's comment about Os and Is tweaked my unreliable memory regarding that practice - I think I now remember where I read that Is were not used in AC Delco Remy (Division of GM) date codes: example 1 (for Is); example 2 (for Is); and, example 3. | | |
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