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Click on image for the lowdown. 
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| | | Forums66 Topics128,037 Posts1,055,465 Members48,422 | | 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!
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#75392 03/25/2007 3:20 AM | Joined: Dec 2006 Posts: 1,464 Shop Shark | | Shop Shark Joined: Dec 2006 Posts: 1,464 | Had another thought on this: do a Google search for SM420, you'll see lots of articles, pictures, date codes, etc. Found out the SM420 was used on Chev trucks from '47 thru '67. | | |
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