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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | 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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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: Mar 2006 Posts: 114 'Bolter | | 'Bolter Joined: Mar 2006 Posts: 114 | I am familiar decoding the NORMAL factory engine assembly serial number found on machined pad at the base of the distributor. However, when it deviates from the normal factory coding, I haven't found a source to decode it.
Here's my example. I have a 1959 235 6cylinder engine.
The engine serial number is "12745 er CAL".
I believe this is a "replacement" engine. Not sure if GM replacement or from some engine rebuilder shop.
Does anyone know where there is documentation on this type of coding? I would like to learn more.
Thanks,
Brian
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