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Click on image for the lowdown. 
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| | | Forums66 Topics128,109 Posts1,056,258 Members48,437 | | 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
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jul 2013 Posts: 200 'Bolter | | 'Bolter Joined: Jul 2013 Posts: 200 | Many of those mystery numbers and letter codes only have meaning to GM and/or the persons sorting those components into groups for assembly. They mean nothing to the average guys on the street like us. Every once in a while you'll even see a green paint dot or orange paint dot on them also. Just some method for them to group or organize them prior to assembly. It could have to do with the weight of them or the actual size of the piston skirts...who knows, its not important to us though.
We cannot solve our problems today using the same thinking we used when we created them!
Albert Einstein
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