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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,114 Posts1,056,605 Members48,450 | | 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 2001 Posts: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | The 261 was made for big truck (in Chevrolet terms). All years came with a high-lift cam (many would argue it is simply a "higher lift" cam).
The only significant difference over the 261 years (besides an later increase in compression) was the only use of a full-flow oil filtration in any GM vehicle (1958-1963).
The USA truck 261 was made to be a high-torque hard-working engine.
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