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Click on image for the lowdown. 
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| | | Forums66 Topics128,090 Posts1,056,024 Members48,432 | | 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!
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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: Sep 2008 Posts: 872 Shop Shark | | Shop Shark Joined: Sep 2008 Posts: 872 | It was probably used as an oil filter return line. On certain GMC 270s that's what they are used for. Its a quick and easy way to return oil to the pan without drilling the block. | | |
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