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| | | Forums66 Topics128,021 Posts1,055,372 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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| | | | Joined: Feb 2006 Posts: 222 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 222 | I bought an HEI distributor for a small block. Now when the engine accelerates it stumbles. I watched the timing while reving the engine and noticed the vacuum advance retarded the timing, the engines stumbles and the centrifugal advance then advances the timing. Anyone ever experienced this before? | | | | | Joined: Mar 2010 Posts: 10,270 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,270 | You may have the distributor vacuum hose at the wrong port on the carb.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Feb 2006 Posts: 222 Shop Shark | | Shop Shark Joined: Feb 2006 Posts: 222 | I found out that some of the HEI distributors use the vacuum assembly to slightly retard the timing when the vacuum falls. This is designed to some how enhance power when the vacuum falls. I don't understand it, just read it!
| | | | | Joined: Mar 2010 Posts: 10,270 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,270 | I will have to tackle this very problem soon. I have a 1970-something Pontiac Q-jet Carburetor on a Chevrolet 350 and have to figure out where to put that vacuum line.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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