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Click on image for the lowdown. 
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| | | Forums66 Topics128,066 Posts1,055,876 Members48,428 | | 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: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | If its original it would have to be a SM420 because the 283 was only available for a short time and the 420 was all that was available in those years as far as 4 speeds go. But as Steve pointed out, who knows what someone has installed in the last 50 something years. | | |
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