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Click on image for the lowdown. 
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| | | Forums66 Topics128,078 Posts1,056,036 Members48,433 | | 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: Aug 2011 Posts: 45 Wrench Fetcher | | Wrench Fetcher Joined: Aug 2011 Posts: 45 | All of the gmc engines had a canister filter from the factory. The small plug at the back of the engine is normally used for the guage. Where the guage is now, that port would normally go to the filter. If you go to www.oldgmctrucks.com there will be an artical with pictures on the proper oil filter routing. Good luck.
The older I get, I only want to work on older rigs.
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