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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: Jul 2010 Posts: 592 Shop Shark | | Shop Shark Joined: Jul 2010 Posts: 592 | The aux oil line is a back-up bringing oil up to the rocker assembly in case the feeder tube from the oil pump gets clogged with sludge, a common problem with these engines.
It has nothing to do with the oil filter. In fact, the oil filter should help to eliminate sludge.
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