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| | | Forums66 Topics128,108 Posts1,056,238 Members48,437 | | 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 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | Have you checked a GMC Maintenance Manual or Master Parts Book?
Recently, I have been working on a GMC 350 (2-ton) 270 engine. It does not have a vacuum advance unit, and I was told this is normal in GMCs larger than 1 ton. I am not near my manuals, so I cannot check this out.
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