| |
Click on image for the lowdown. 
====
| | |
2 members (NJC, 1 invisible),
109
guests, and
2
robots. | | Key: Admin,
Global Mod,
Mod | | | Forums66 Topics128,083 Posts1,055,967 Members48,430 | | 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!
| | THANKS!
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: Feb 2000 Posts: 69 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 69 | Just wondering; are the valve springs heavier on the 261 motor? | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | In 1954, the first year of the 261 engine, "Higher load inlet and exhaust valve springs required by the higher valve lift were used [compared to the Loadmaster 235]. . . More rigid valve rocker arms and larger diameter push rods are used to minimized valve train flexibility with the higher operating stresses due to the high-lift cams and the rocker shaft wall is thicker for greater rigidity." (from 1954 TRUCK ENGINEERING FEATURES - Chevrolet/GM) That same manual seems to indicate that the 261 mechanical valve tappets (lifters) were also made of a different alloy iron, compared to the 235.
The information above was for 1954, perhaps in later years, the 261 and 235 truck engines used the same valve train parts? The Master Parts Manual seems to indicate that 235 and 261 valve train parts were the same from 1956 onwards.
Tim | | |
|
|
| |
