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Global Mod,
Mod | | | Forums66 Topics128,090 Posts1,056,020 Members48,430 | | 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: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | When I here poor gas mileage I always suspect the carb base gasket.
If you still have a Rochester carb the base gasket needs one of the four slots in it to line up with the power valve port hole on the bottom flange.
Most rebuild kits come with the wrong gasket which blocks the port.
Incorrect timing or a bad vacuum advance can also be the problem.
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