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Click on image for the lowdown. 
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| | | Forums66 Topics128,035 Posts1,055,566 Members48,426 | | 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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| | | | Joined: Mar 2004 Posts: 6,214 'Bolter | | 'Bolter Joined: Mar 2004 Posts: 6,214 | 1947farmer, There will be a long casting number on the side of the block. This number would be used for only a few years, so by knowing the casting number and date code you can ID the engine block. I don't believe any casting number ever lasted 10 years, they are always changing things which then makes them change the casting number. Hope this helps! Mike B  | | |
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