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Click on image for the lowdown. 
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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!
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| | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | jhaa,
Yellow was supposedly the 261 truck engine color in 1957.
As stated above, the major difference between 57 and 58-62 261s is the by-pass oil filtration in 57 and full-flow oil filtration in 58-62. There are also differences in how the oil passes from the cam ends through the lifter journals to the head/rocker-arm assembly (and a few different parts in these areas).
Just out of interest, does the engine have a PCV system?
Tim | | |
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