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HELP! ASAP! How do I adjust the richness on a Holley Carb?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 72Blazerod, Sep 18, 2000.

  1. 72Blazerod

    72Blazerod 1/2 ton status

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    I just failed my emissions test and I have tonight to try to fix the problem myself. I want to know how to adjust the richness mixture on a Holley Carb. Unfortunately, I don't know the model number because the carb was on my truck when I got it. I have never worked on a Holley before and I need your help.

    Yes it is a four barrel on a 72 350 engine with a manual choke and a SM465 (if this helps)

    Thanks in advance,

    72Blazerod
     
  2. sosamantx

    sosamantx 1/2 ton status

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    <font color=blue>I don't know which Holley you have, but I hope that this helps. - Steve</font color=blue>
    <font color=purple>"Most Holley Street Performance, O.E. Muscle Car, Competition and Pro-Series HP carburetors utilize idle mixture screws, located on the sides of the primary metering block. These control the volume of the pre-mixed air/fuel coming through the idle well. Turning the screws clockwise will "lean" the idle system. Conversely, turning the screws counterclockwise will "richen" the idle system.</font color=purple> <font color=blue>Straight from their website</font color=blue>
    http://www.holley.com/HiOctn/TechServ/TechInfo/TI-219.html Above info

    http://www.holley.com/HiOctn/TechServ/TechInfo/FMCTech.html Tech info

    <font color=blue>Steve Sosa a.k.a. "sosaman"</font color=blue>
    http://sosaman.home.texas.net/carpics.html
     
  3. 72Blazerod

    72Blazerod 1/2 ton status

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    Steve,

    Thanks for the great info. I think I have been able to decifer where the "idel adjustment" screws are for the diagrams that I found on the Holley sight. Thanks a ton for putting those Holley addresses right into your post! I am going to give it a try then tell you how it goes.

    Thanks,

    Rod (72Blazerod)
     

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