340-4 Carter AFB 4 bbl help

Discussion in 'Small Block Tech' started by Double6skylark, Apr 14, 2018.

  1. Double6skylark

    Double6skylark Well-Known Member

    Anyone out there upgrade from a factory Carter 4 barrel on their 340 sbb?
    Trying to see what other people have tried and what would work the best.
    Thanks in advance for any insight.
     
  2. ragtops

    ragtops Gold Level Contributor

    I put an Edelbrock carb on a 67 340. The Edelbrock linkage hit the intake so I used a spacer to raise the carb so the linkage would clear, this one
    http://www.jegs.com/i/Mr.-Gasket/72...MIir7ghI662gIVW7nACh2oJwvJEAQYASABEgJKXvD_BwE
    But you could use a solid one also.
    Also on another 67 340 I used a Quadrajet, using this adapter, or one like it
    http://www.michiganmotorz.com/edelb...MIz6_u9oy62gIVlrjACh2ttwkUEAQYBSABEgK2SPD_BwE
    Note THE BOLT PATTERN ON YOUR EXISTING 4BBL MANIFOLD IS THE SAME AS A QUADRAJET. The quadrajet will bolt directly to your manifold, but you need the adapter to allow the large rear throttle plates to open.
    The quadrajet worked great for me.
    On both carbs you will need to fabricate a bracket or whatever you need to hook up your linkage to the switch pitch converter, if you still have it.
    There are people who can rebuild your existing AFB and make it work well. One is Ken at Everyday Performance. He had done one for me and it was great. He does a lot of carbs but Quadrajets are his specialty. He is a member here and is highly thought of.
    http://www.everyday-performance.com/
     
    Double6skylark likes this.
  3. Double6skylark

    Double6skylark Well-Known Member

    Thank you to @ragtops, realy appreciate your help and links.
     
  4. Double6skylark

    Double6skylark Well-Known Member

  5. DEADMANSCURVE

    DEADMANSCURVE my first word : truck

    Nice looking Motor . Raider Nation .
     
  6. 67skylark27

    67skylark27 Brett Jaloszynski

    I put an Edelbrock AVS Thunder series #1806 on mine. Fine tuning it now.
    Works great. Currently changing it to a bit leaner.
     
    Double6skylark likes this.
  7. Aaron65

    Aaron65 Well-Known Member

    What's wrong with the Carter? Unless it's worn completely out, it will probably run better on your 340 than anything else you put on it. Of course, 50 years is a long time for some parts, and sometimes things are just worn out.

    The problem with an aftermarket carb shows up if you have a switch-pitch converter. You have to fabricate a bracket for the microswitch.
     
    Double6skylark likes this.
  8. alec296

    alec296 i need another buick

    Quadrajet Power can do a nice rebuild of your carb with performance tweaks. Would be better choice considering that it’s closer metering to your engine then a universal replacement carb that will need jetting changes for your needs. And then as mentioned making a change to get trans linkage to work
     
    Double6skylark likes this.
  9. Double6skylark

    Double6skylark Well-Known Member

    Thank you for all your insight, I have the original Carter AFB which needs a complete overhaul so I was leaning towards something a bit more modern like the Edelbrock AVS2 #1906 (650 cfm).
    Anyone out there have any experience with this carb?
     
  10. Double6skylark

    Double6skylark Well-Known Member

    Haha, didn't think about that when I was painting it. Just wanted it to be a little different from factory without being too over the top.
     
  11. Double6skylark

    Double6skylark Well-Known Member

    Going to go with a 200-4R when I install her into the car.
     
    300sbb_overkill likes this.
  12. alec296

    alec296 i need another buick

    The Avs carb will not be tuned or jetted for your engine, it’s a universal carb. And I would believe Mark at Quadrajet Power can add a linkage to your carb for a 200. Don’t forget that the overdrive does drops rpm too much with a 2 series rear end . So mpg and power could suffer
     
    Double6skylark likes this.
  13. Double6skylark

    Double6skylark Well-Known Member

    Rear end is next on my goal list, any suggestions on what works good?
     
  14. alec296

    alec296 i need another buick

    3.23. Good all around. If you want more aggressive low end pull , 3.73.
     
    Double6skylark likes this.
  15. 67skylark27

    67skylark27 Brett Jaloszynski

    I have the Edelbrock AVS 1806 which I am currently fine tuning as it is a bit rich.
    I bought that one so I'd have the correct linkage for my 200-4r transmission.
    I went with 3.36 gears and posi and couldn't be happier. I did have to use a carb spacer
    and grind a small spot down on my intake. Just put the insurance on the car today
    so now I can give it another shake down run and see how my carb tuning is going.
    It's very easy to adjust!

    Here's a write up on my carb swap plus the rest of my shenanigans.

    http://v8buick.com/index.php?threads/1967-skylark-nearing-completion.228896/page-4
     
    Double6skylark likes this.
  16. 67skylark27

    67skylark27 Brett Jaloszynski

    I did end up having to lean the carb out. I went 8% leaner based on the chart. Kind
    of wish I would have just bought the jets and rods to do that rather than
    the whole kit. Could have saved a couple bucks!
     
    Double6skylark likes this.
  17. 12lives

    12lives Engage! - Jean-Luc Picard

    Send it to Tom Telesco (TelRiv) on this board. The Carter is better than the newer Edelbrook, my opinion.
     
    alec296 likes this.

Share This Page