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4-71 Dual Quads

Discussion in 'The Hokey Ass Message Board' started by shane85, May 26, 2013.

  1. shane85
    Joined: Nov 30, 2005
    Posts: 257


    Is anyone running Edelbrock 1405 carburetors on a dual quad set-up on a 4-71 for small block Chevrolet?
  2. PackardV8
    Joined: Jun 7, 2007
    Posts: 893


    No, but I'm sure it's been done, even if it's wrong. We've seen photos of 4-4bbls on blowers. For some too much is not enough.

    IIRC, the inlet of the 4-71 is so small, 2x4 would not dump straight in and would require a tall carb mount plate longer than the blower case. That's probably why I can't remember ever seeing an aftermarket 2x4 setup.

    Decide if you want max power or outrageous appearance. If just max power with driveability, then a single would be the way to go.

    jack vines
  3. madmak95
    Joined: May 12, 2005
    Posts: 773


    I dont know what carbs ill run on my 331 hemi but I lucked out and found this 4-71 2-4 adapter at a swapmeet.

    Sent from my DROID device using the TJJ mobile app

    Attached Files:

  4. shane85
    Joined: Nov 30, 2005
    Posts: 257


    Well I know it's been done. Weiand made a 4-71 adapter for 2x4 barrel carbs. Just seems like an awful lot of carb .It's what i have on my 4-71.

  5. I had two (i thunk 650s) on a 283 and it ran awesome. Got 20 mpg on highway. Carl5coupe has the engine and blower set up now. I ran them progressive and linked one to one for max power. Awesome.
  6. amadeus
    Joined: Dec 27, 2006
    Posts: 321


    Not sure if this will apply to you with the smaller 4-71 but you should research "boost referencing -carburetor" (which will apply to a carb with power valves) if performance is your goal ; but being that you are thinking of running the edelbrocks I'm guessing that on a low boost,street driven car this will not apply?
    Last edited: May 26, 2013

  7. My AFBs are also not boost referenced but set up for proper enrichment in the secondaries. Not a bad idea in theory but not absolutely necessary either. Lots of opinions out there. I've got plenty of miles and great performance without boost referencing.
  8. Mnhotrodbuilder
    Joined: Jul 12, 2010
    Posts: 1,142

    from Afton, MN

    Yeap they make/made them, I picked up one a while ago. I still have to find carbs for it though. What type of carbs are you running?
  9. choppedtudor
    Joined: Nov 28, 2009
    Posts: 686


    I'm gonna run 2x2 on mine:

    Attached Files:

  10. Jmountainjr
    Joined: Dec 29, 2006
    Posts: 1,377


    but you should research "boost referencing -carburetor" (which will apply to a carb with power valves)

    Great advice if running a Holley carb with vac operated power valves. But the AFB / Edelbrock use metering rods for the transition enrichment, so there is no need to reference any vac signal.
  11. Lockjaw
    Joined: Sep 1, 2003
    Posts: 169


    i'm running 2-500cfm afb carbs. a bit rich on the lower end but i'm happy with the way it runs

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  12. I ran these two stock 425 AFB's for 5 years on the street. They were just as they had come off a '56 Corvette, on a Weiand adapter, and they ran great. The engine was 292 ci, 8:1 with a 315 Duntov cam. As good as it got in '63.

    silent rick likes this.
  13. shane85
    Joined: Nov 30, 2005
    Posts: 257


    on stock jet?

  14. nexxussian
    Joined: Mar 14, 2007
    Posts: 3,240


    I remeber seeing a fellah from Montana that had two Edelbrock carbs on a 471 on a SBC, in an Anglia.

    Saw him at the GG Spokane event a few years ago (one of the places we go after Speed Week) he had driven the car there from Montana (or so he claimed, looked like a reasonable calim at the time).

    His linkage was set up direct (1:1) I don't recall what size carbs. :(
  15. aus996
    Joined: May 24, 2012
    Posts: 13

    from australia

    Just looking at two 625 afb,s using one of the weiand duel quad adapters myself, overkill maybe but it sure looks good
  16. shane85
    Joined: Nov 30, 2005
    Posts: 257


    cool i have 2 600 cfm on a weiand its wayyyy rich on stock parts
  17. abone1930
    Joined: Jan 16, 2006
    Posts: 1,322


    I picked me up a complete 471 setup for a SBC setup , one had dual AFB's on it, anybody know a vintage looking scoop that would go with this setup . Going 60,s style with my willy gasser project. The carb adapter setup is also weiand


    Posted using the Full Custom H.A.M.B. App!

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  18. mechanic58
    Joined: Mar 21, 2010
    Posts: 681


  19. Thanks man. It was a 3.90 gear and the tires were 31.5" dia bias
  20. shane85
    Joined: Nov 30, 2005
    Posts: 257


    what ignition is in your car?
  21. MSD Btm
  22. 41rodderz
    Joined: Sep 27, 2010
    Posts: 5,718

    from Oregon

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