Thread: Holley carburetor has No manifold Vacuum inlet ports! What to do
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Old 05-17-2026, 03:37 PM
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Bermudagto Bermudagto is offline
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Well there are 2 stamped circles on the lower front of carb. I’m supposed to drill one out and add threads to it for a vacuum inlet? Holy S..t that looks difficult. See pic
Oh my carb is an Ultra XP Campbell 4150 so I just read those don’t always come with any vacuum ports. Hopefully I can just use the main port in my Intake for everything? Brakes/PCV/Transmission vacuum ?
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Last edited by Bermudagto; 05-17-2026 at 03:46 PM.
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