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  • 2 Post By jerry clayton

Thread: 700 CFM double pump Holley enough for 396?
          
   
   

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  1. #1
    Jason_Lyman is offline CHR Member Visit my Photo Gallery
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    Aug 2017
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    Cedar Park
    Car Year, Make, Model: 1968 Camaro
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    700 CFM double pump Holley enough for 396?

     



    Hello all,

    I'm getting close to engine assembly time. I have a Holley 700 double pump 4150 mechanical secondary carb. Have had it for years. It was great on a hot 350 (jetted way down). Now I'm building a 396. I'm wondering if this is enough carb or if I need to explore something larger. Engine details:

    396, 30 over
    10 to 1 flat tops
    Cam: Howards CL123315-08
    ----Advertised duration 280/280
    -----0.050" duration 227/227
    -----Valve lift 0.555" / 0.555"
    Intake: Weiand Stealth
    Heads: AFR Magnum 265CC Oval Port

    Other details: 2500 RPM stall, 355 gears.

    Appreciate whatever feedback is thrown out here!
    1968 Camaro
    Owned since 1992
    Parked since 2001
    Under restoration now that first kid is headed to college.

  2. #2
    glennsexton's Avatar
    glennsexton is offline CHR Member/Contributor Visit my Photo Gallery
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    Tigard
    Car Year, Make, Model: 63 Nova SS
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    Welcome to CHR!

    Sounds like you’ve got a good build going. I don’t think your 700 is large enough.

    If it were mine – I’d put a stage 3 Quadrajet:
    https://www.summitracing.com/parts/jet-36003

    This carburetor would require an adaptor to run on the Weiand Stealth (which I like too) i.e., an Edelbrock 2693 which would raise you up another ¾ inch.
    https://www.summitracing.com/parts/edl-2693

    If you stay with a square bore, the Holley Street Avenger gets good marks:
    https://www.summitracing.com/parts/hly-0-80870

    Others will chime in I’m sure.
    Glenn
    "Where the people fear the government you have tyranny. Where the government fears the people you have liberty." John Basil Barnhil

  3. #3
    jerry clayton's Avatar
    jerry clayton is offline CHR Member Visit my Photo Gallery
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    If you have progressive linkage to another one---------as in dual four---------
    NTFDAY and glennsexton like this.

  4. #4
    Jason_Lyman is offline CHR Member Visit my Photo Gallery
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    Cedar Park
    Car Year, Make, Model: 1968 Camaro
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    Thanks for the responses.

    I need to go do some reading on quadrajets. I've just done a small amount of browsing and I see all sorts of people saying QJ over Holley.

    While I'm not trying to build the fastest street car in America, I'm not concerned about gas mileage. This will not be a daily driver. It will be a cruiser. I'm wanting every ounce of performance out of it I can get.

    Jason
    1968 Camaro
    Owned since 1992
    Parked since 2001
    Under restoration now that first kid is headed to college.

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