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Click on image for the lowdown. 
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| | | Forums66 Topics128,021 Posts1,055,348 Members48,420 | | 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 | Which spark plug (number & location) are you connecting the timing light to? If you have a vacuum gauge, attach it to the wiper port in the intake manifold, under the carburetor. Rotate the distributor to obtain maximum vacuum (warmed-up engine at idle). This will get you close to optimum vacuum. Stovebolt Engine Tuning using a Vacuum Gauge | | |
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