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Click on image for the lowdown. 
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| | | Forums66 Topics128,078 Posts1,056,024 Members48,433 | | 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: Sep 2012 Posts: 74 Shop Shark | | Shop Shark Joined: Sep 2012 Posts: 74 | There is a cast number to the right of the distributor 3837004 with GM20 below it
The numbers stamped to the left of the distributor read F523A R750
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