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Mod | | | Forums66 Topics128,177 Posts1,057,060 Members48,460 | | 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!
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| | | | Joined: Dec 2007 Posts: 45 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2007 Posts: 45 | My 261 has two ports near the oil line that feeds the external oil filter. One is a 1/4" the other is a 1/2". I'm not sure if they are on a common gallery or different/ I would suspect that the 1/4" pot is the proper choice. Anyone KNOW for sure is intended for the oil pressure gauge? | | | | | Joined: Sep 2006 Posts: 2,393 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 2,393 | You can tee off the 1/2" NPT fitting from the lower port that feeds your filter.You can mount a gauge next to the block if you want.The 1/4" hole is plugged on my 261.
Drew
| | | | | Joined: Jan 1970 Posts: 365 Shop Shark | | Shop Shark Joined: Jan 1970 Posts: 365 | The smaller port (1/8" NPT) is a port that drains to the sump. This port would only be used for the old bypass filter.
I connected my oil pressure gauge to a port near the front of the engine. Between the generator and the block is a 1/8" NPT plug that is common to the galley that feeds the main bearings. | | |
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