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Click on image for the lowdown. 
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7 members (GMCJammer51, wilbur53, Peggy M, Tinker5, TUTS 59, Wickedbass, 1955 1 Series),
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Global Mod,
Mod | | | Forums66 Topics128,038 Posts1,055,471 Members48,424 | | 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 2013 Posts: 568 Shop Shark | | Shop Shark Joined: Aug 2013 Posts: 568 | I've only seen them on diesels. My cummins has one. Doesn't seem needed as no gas motors incorporate them on a fuel system.
I can explain it to you, I can't understand it for you.
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