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How to hook up vacuum lines for holley 600 cfm

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Where do you hook up the vacuum lines on a holley 600? 80457-3 carb

Posted on Nov 05, 2012

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When attaching vacuum lines, you need to remember only one thing. Mark each hose when you remove it from the original carb (quadrajet?) Hoses that attach to the baseplate are at full vacuum and should be returned to a similar location or to the manifold, using a "tree". Hoses that are connected to the body of the original carb only see vacuum when the throttle is opened. Those can be attached to the fitting on the right side of the front metering block. Most Holley carbs have no provision for the valve located at the front of early Q jets (bowl purge) nor do they have any electrical connections except for the choke mechanism.
The most important vaccuum line is the one for your power brakes. Make sure that one is firmly connected either to the rear of the carb baseplate or the manifold. All other lines are nowhere as critical as that one is..

Posted on May 18, 2011

  • Richard Scordino Aug 14, 2011

    I omitted one important item. Since you thought I was "trying" when in fact what I gave you was valid info, Have someone who has some experience do the routing for you. I will make sure that I do not answer any more questions of this type again. I hate having my rating lowered after giving an answer to something I could do in my sleep. Thanks!!!!

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