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Mod | | | Forums66 Topics128,101 Posts1,056,181 Members48,436 | | 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!
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#21177 06/01/2004 8:26 PM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | I used to get around 16 in my 74, got around 19 in an 80 van. Improvements aren't that easy. For one or two mpg drop in a HEI with an advance kit. For anything better you need to change the rear end gears or put in an overdrive tranny.
Fred
52 3600
69 C-10
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