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Hot Rods Carbs on a nailhead

Discussion in 'The Hokey Ass Message Board' started by buickwagon, Mar 10, 2022.

  1. Hi guys, Freshly rebuilt 401 bored 30 over, stock cam, running a cast iron dual 4 intake, in a model A roadster pickup. ( 200R4.trans / nine inch rear)

    looking for carb suggestions, I am leaning towards a pair of 650cfm Edelbrock thunder carbs but open to suggestions ? Is 2 x 650 cfm too much ? / too little ?

    what ya running on yours ?

    thanks all
  2. Check out Russ Martin's website, I am building a similar 401 with a TA-25 cam and am using a single 800 CFM. He says go big with Nailheads.
  3. 272714739_4779370598764645_6276279250788120130_n.jpg

    Friend o mine is running this deuce nailhead with 6 Holleys. It's a fairly new build. I'll see him soon, ask how it's going.
    swifty, Deuces and alfin32 like this.
  4. carbking
    Joined: Dec 20, 2008
    Posts: 3,311


    Not certain what you might have available in your location, but if you can find them, a pair of ORIGINAL Carter AFB carbs (not the scarce 2x4 carbs) for single carb 401's would be MUCH easier to calibrate than the imitations, and cheaper in the long run. Just use 2 of the same number (3665s are fairly common in the US).

    jimmy six and Rickybop like this.

  5. Rickybop
    Joined: May 23, 2008
    Posts: 7,976

    from Michigan

    With Progressive linkage, no problem. Love it when the second carburetor opens up. A couple of 650s sounds about right, but how about maybe rebuilding a couple of original AFB's?
    jimmy six likes this.
  6. Rickybop
    Joined: May 23, 2008
    Posts: 7,976

    from Michigan

    Great minds think alike LOL.
    jimmy six likes this.
  7. jimmy six
    Joined: Mar 21, 2006
    Posts: 11,226

    jimmy six

    You will never be sorry and if you painted the engine the stock green, the Buick rocker covers and had a wildcat factory air cleaner to me it would be perfect.
  8. Hamtown Al
    Joined: Jan 17, 2007
    Posts: 2,801

    Hamtown Al
    1. Virginia HAMB(ers)

    This works for me.;)
    1965 Riviera Gran Sport 425... all original.;)
    Except air cleaner!!:D
  9. iafraser39
    Joined: Aug 2, 2009
    Posts: 172

    from Warmland

    I'm running an edelbrock 750 on my 425.
    No problems and easy to tune. Good on gas also.
    I chose this set up over multiple carbs.
    swifty likes this.
  10. hemihotrod66
    Joined: May 5, 2019
    Posts: 629


    I believe that if your running duel quads that for most street applications two 500 cfm carbs will be fine...Most of the old setups were in that ballpark....
    gimpyshotrods likes this.
  11. gimpyshotrods
    Joined: May 20, 2009
    Posts: 20,209


    Dual 500s, max.

    Bigger is not better. You will lose low-end torque and throttle response.

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