Which 4bbl carb for a 65 273

Early A-Body Discussions

  1. gts1

    gts1 Well-Known Member

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    Need to buy a new carb for my 65 valiant vert. I'm converting from a 2bbl to a 4bbl specs are Stock 273 rebuilt, original 65 4bbl intake,2in duel exhaust,4speed out of a 70 340 duster upgraded 10in clutch 81/4 rear with 3.73 gears.can you guys suggest a carb Holley or eddy 500 or 600 cfms Thanks
     
  2. krazykuda

    krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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    You need to verify that the butterfly's on the carb open all the way on your intake to make sure that it will work. If the butterflys on the carb are bigger than the holes in the intake, then they will not be able to open fully if at all...
     
  3. lou3500

    lou3500 Fla. Cuda Guy

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    I use a 500 cfm eddy on my 273 with 66 formula s 4bbl manifold [i swapped out the 2bbl] and i use a 1 inch phonolic spacer. Gonna have to modify your kickdown rod [extend it] and get an adaptor kit from eddy for the throttle linkage along with a taller intake mount for the throttle cable.
     
  4. chewy

    chewy Well-Known Member

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    If you cant find an original AFB, the Holley Street Avenger 570 w/Manual Choke works pretty good on the 273, if you have the hi compression pistons. Else, probably go with a 500.

    The last one I setup, needed very little dial in. It was out of the box, installed and running within 10 min.
     
  5. pishta

    pishta I know I'm right....

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    Carter/brock 500, bout as close to stock as you will find unless you find one used which may be less than as 500 new, as they are about 100 more than a 600....?
     
  6. 65 Dartman

    65 Dartman FABO Gold Member FABO Gold Member

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    I'd have to double check but may have an extra AFB that was for the 65 273/235 motor
     
  7. 4spdragtop

    4spdragtop CONGRATS NORTH AMERICA! FABO Gold Member

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  8. pishta

    pishta I know I'm right....

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    That would be a score. it would be a 4119/4121 for a manual or a 4120/4122 for an auto. second number is "clean air package" and may have 3 stage rods with dimpled rod covers.
     
  9. chewy

    chewy Well-Known Member

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    Arent those '66 Carb numbers.

    I have the original Carter AFB 3853S on my engine that came with my car.
    The Automatic carb is the Carter AFB 3854S.

    I sold a siezed/locked up 4120 at MATS a few years back for $25 as parts. I'd picked it up for about that for the choke butterfly, but it was different than the ones on the '65
     
  10. pishta

    pishta I know I'm right....

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    My Year One reprint FSM is a 65-66 so they may be 66 numbers for sure.
     
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