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I asked your question on another old car forum. .... BTW, one of the challenges of tuning the Holley 850 XP is that it doesn't come with a vacuum port. So unless you have added one to the carb or intake, the traditional method of using a vacuum gauge won't work. That is another reason the AFR readings are valuable.
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Tommy
Cheetah tribute completed 2021 (TommysCars.Weebly.com)
Previously owned EM Cobra
"Never attribute to malice that which is adequately explained by stupidity." - Hanlon's Razor
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