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Thread: 670 Street Avenger & Annular Boosters?

  1. #1

    Default 670 Street Avenger & Annular Boosters?

    I have this carb, but would much prefer the annular boosters. Can this carb be fitted with annular boosters? If so, what will it take to perform the upgrade? Thanks. This is my first post on this website.

  2. #2
    Join Date
    Jan 2010
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    You need the Holley booster tool plus the additional adapter to allow the tool to fit the annular booster:
    https://www.summitracing.com/int/par...6074/overview/
    https://www.summitracing.com/int/par...6070/overview/
    I have all the tools for Holley in my toolbox. Alternatively, you can take your main body and your new boosters to a GOOD carb shop who is equipped to do this.
    Since you won't be doing this too often, the tools are expensive, and might not be justifiable unless you wish to do many carbs.
    Once you've had this done, you will need some recalibration, main jets, power valve channel restrictions (PVCRs), and high speed air bleeds. Gary
    Last edited by Gaz64; 07-09-2019 at 12:50 AM.
    Regards, Gary

  3. #3

    Default

    Ouch! I got this idea from the new Edelbrock AVS2 carb. Since I already have the 670, I thought it'd make more sense to convert it to the annular boosters. I didn't know it'd be an expensive ordeal.

  4. #4
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    Yes, the annulars are a great idea, goes back a few years now.
    The Edelbrock carbs have just recently come out with annulars, but only on the primary side.
    The factory Holley annulars are 8 hole, but you also get 12 and 17 hole billet inserts.
    I have 12 hole insets in a 4010 750 DP, and 17 hole inserts in a 4150 850 XP DP. Gary
    Regards, Gary

  5. #5

    Default

    So the 670 Street Avenger can be converted to annular boosters, but at a very high cost? I've been surfing the internet looking for annular boosters, and have found a few online that seem affordable. However, from what you've said this can't be done without the special tools? It sounds like it would be more cost effective for me to purchase the Edelbrock AVS2.

  6. #6
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    Fitting annular boosters to a 670 will produce a more responsive booster signal, at the expense of reduced total airflow. Typically about 50 cfm loss. The tools will cost you about $300. Then all the tuning; main jets and high speed air bleeds. Gary
    Regards, Gary

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