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Click on image for the lowdown. 
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| | | Forums66 Topics128,162 Posts1,057,047 Members48,463 | | 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
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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | The bolt pattern a SM420 uses started in 1948 in trucks. It is the same bolt pattern passenger cars started using in 1955, if that helps.
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