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Click on image for the lowdown. 
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Global Mod,
Mod | | | Forums66 Topics128,064 Posts1,055,860 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!
| | 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: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | All 235's have 1/8" pipe fitting connections on the block.
1954-57 261 also have 1/8" fittings, but in 1958 when the full flow filter was added the fitting size increased to 1/2", There should also be a pin ahead of the supply port which was to control the oil flow depending on whether a filter was used or not. His engine pic does not have the control pin.
See the USA in your vintage Chevrolet! My Blog | | |
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