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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | 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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