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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: Jul 2009 Posts: 27 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2009 Posts: 27 | will someone direct to the info on determining if a 235 and or 261 is full flow oil .I've got a 261 with block #3769925 and head 3836850.I've got 235s and a deal on another 261 but don't know if I'l need to convert any or all .So is there a link or tool to know what they are?Thanks Sid Stephenson | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | I take it that you're asking about full flow oil filtration, and not full pressure lubrication. On the full flow filtration, 235s never came that way from the factory, only bypass. The 261 went to full flow filtration in '59, and can be identified easily by chacking the size of the oil line fittings. They are 1/2" npt on full flow engines, 1/8" npt on bypass.
Bill Burmeister
| | | | | Joined: Sep 2007 Posts: 393 'Bolter | | 'Bolter Joined: Sep 2007 Posts: 393 |
It's a small world, but I wouldn't want to paint it.
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