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Click on image for the lowdown. 
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9 members (FAST55, sron48, Jon G, Jay R, Otto Skorzeny, truckernix, JW51, dt235sd, 1955 1 Series),
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Mod | | | Forums66 Topics128,094 Posts1,056,155 Members48,436 | | 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 | The 503 is a huge, heavy low RPM engine. A 302 was used in up to 450 series. In 55 a 503 appeared in a 630 series. The hood on a 630 series is about 6 or 8 inches longer in a 630 series than a 450 series if that tells you anything. My first semi was a 550 series with a 370 V8. The 370 turned out more HP than the 503 and the 550 series uses the same hood as a 450 series. | | |
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