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Old 08-21-2002, 10:47 AM
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Post Carb Time.

I have a 400 ci Pontiac with a 4 barrel Carter carb. It has a weak spot when you ease into it at around 1,000 RPMs and i understand that this is from a lack of a secondary vacuum on the carb. Also, i have heard i would have to buy a Holley to remedy this. I don't have the money to go out and buy a new Holley at the moment, and i also don't want to spend an hour or more tuning it before i drive it every time i drive it, being as it is a daily driver. Any thing that i may be able to do for this that doesn't require a new carb, or of not, a suggestion of a Holley with the secondary vacuum that won't require constant tuning to drive. My carter is like a set it and forget it. I tuned it once and i haven't had a problem since, except the weak spot.

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Croz
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Old 08-21-2002, 10:54 AM
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Check the accelerator pump rod. It should have 3 adjustment holes. Try the top one (closest to the carb). The secondaries on this carb, if it is the one I'm thinking of (simular to the edelbrock) are mechanical with an air door. The secondaries wont function till about 3/4 throttle. Check for vacuum leaks as well.
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Old 08-21-2002, 11:03 AM
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yea, that would be about right, it picks up at 3/4 if you can get it there... very few people can drive it without killing it, takes some training.
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