Holley Carburetors

Discussion in 'Small Block Tech' started by Bradley Newsom, Aug 15, 2019.

  1. My vacum secondaries will not open from a dead stop, to big of a cam not enough vacum ????
     
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    Last edited: Aug 15, 2019
  3. From the line it will not even spun the tires but has enough power to chirp the tires when it shifts to second
     
  4. Oh it has 3.42 gear.
     
  5. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    alec296 likes this.
  6. Mark Demko

    Mark Demko Well-Known Member

    There not suppose to open from a dead stop.
     
  7. Fox's Den

    Fox's Den 22 years of racing the same 355 Buick motor

    Do you have a TA intake or a stock intake.
    Stock intake does not like square bore carbs if you use the adapter.
    You would then have to run the Q-Jet with the stock intake that would be better.
    If you run the TA intake then you can run any carb you like/want.
     
  8. It has the ta intake
     
  9. alec296

    alec296 i need another buick

    Do you have the stage 1 dual plane or the SP3?
    Sounds like you need more tuning and more converter. Hard to say without any engine specs,cam specs what is happening,
    You don’t even mention year of engine.
     
  10. MrSony

    MrSony Well-Known Member

    Vacuum Secondaries are supposed to open gradually, not from a dead stop like a mechanical secondary/double pumper style carb.
     
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  11. DEADMANSCURVE

    DEADMANSCURVE my first word : truck

    Correct .
    If you feel it "kick in" you are actually feeling the stumble recovery .
    Edit : correct , smooth transition . To get rid of the stumble/kick you will need to change the secondary spring opening rate . Check quick fuel part number #63-11 .
     
    Last edited: Aug 19, 2019 at 8:48 PM
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  12. MrSony

    MrSony Well-Known Member

    You aren't supposed to "feel" anything or know the secondaries have kicked in. It's supposed to be a smooth transition.
     
  13. It is the air gap sp3 intake. Engine is about a year old after complete machined. Comp cams thumper cam intake .050 235 exhaust 249.
     
  14. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    That’s a pretty big cam. You’ll need a good converter and 3.42 gears.
     
  15. alec296

    alec296 i need another buick

    You need more converter, get timing in sooner as Larry mentioned. That cam is abit lazy low end, and if your compression isn’t up over 9.5 there will be weak low end torque as well. The cam is more show then go, meaning its meant to make impressive exhaust sound . And it seems to like a lot of timing on the top end.
    Much better cams available and you should check with your builder on what pistons went into the engine, specs , block and head milling to determine final compression ratio. Might be too low for that cam
     
  16. Thanks, yeah it has no stall other then stock right now, going to try about 2800 stall, it seems that's when it wakes up
     
  17. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD"

    patwhac and alec296 like this.

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