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Click on image for the lowdown. 
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| | | Forums66 Topics128,196 Posts1,057,395 Members48,471 | | 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: 29,270 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,270 | http://www.harborfreight.com/fuel-pump-and-vacuum-tester-93547.htmlAdjust the carburetor mixture to achieve maximum vacuum reading (at idle speed). Adjust the timing to achieve maximum vacuum (at idle speed). These settings are about as good as you need on a 216/235/261. There is no quicker and easier way to adjust the mixture and the timing. | | |
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