Chevy 400 2 barrel vs 4 barrel
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  1. #1
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    Default Chevy 400 2 barrel vs 4 barrel

    I have a 74 Impala with a 400 Small block and a 2 barrel carb everyone tells me the car will have more power and get better mileage with a 4 barrel carb. I need someone that has done the swap and seen the results first hand to give me some advice on this
    1987 Monte Carlo T-Top on 26s no lift!
    1974 Impala 58,000 org. miles for sale

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  3. #2
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    mid 70s to mid 80s were the gas saver days and so they put smaller carbs on the big motors to use less gas. Edelbrock recommends a 650cfm carb I believe for that size motor and I doubt your 2 barrel moves that much air. A 4 barrel will also use more gas, I dont see how it would use less? Its the same as a 2 barrel, 2 barrels are used all the time but when you open the throttle all the way the other 2 open. So you would feel the most difference when you floor it.

    Its a pretty easy swap. New intake, carb and maybe throttle linkages. If you want to go cheap there are tons of used aluminum intakes on craigslist and ebay and some carbs but I would rebuild them if they are used.

  4. #3
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    People say that the 4 barrels have smaller primaries than a 2 barrel so if you keep your foot out of ityou use less gas
    1987 Monte Carlo T-Top on 26s no lift!
    1974 Impala 58,000 org. miles for sale

  5. #4
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    yea look at the barrels on the bottom, some 2 barrels are big some are small, all 4 barrels are pretty small

  6. #5
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    put a 4 barrel stock and disconnect the 2 back barrels so when you press the gas pedal the 2 back barrels don't open up

  7. #6
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    Quote Originally Posted by Ulysses 2 View Post
    I have a 74 Impala with a 400 Small block and a 2 barrel carb everyone tells me the car will have more power and get better mileage with a 4 barrel carb. I need someone that has done the swap and seen the results first hand to give me some advice on this
    its personnel preference too.... how's it run to you?.... does it have the power you want when you step on it?

    2 barrels run fine.. but if you want that extra punch do the intake and carb swap... it's pretty easy
    GLASSHOUSE FIEND

  8. #7
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    Quote Originally Posted by harborareaPhil View Post
    its personnel preference too.... how's it run to you?.... does it have the power you want when you step on it?

    2 barrels run fine.. but if you want that extra punch do the intake and carb swap... it's pretty easy
    Yup
    1964 JET-SMOOTH LUXURY CHEVROLET

  9. #8
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    Quote Originally Posted by harborareaPhil View Post
    its personnel preference too.... how's it run to you?.... does it have the power you want when you step on it?

    2 barrels run fine.. but if you want that extra punch do the intake and carb swap... it's pretty easy
    It runs great right now it just seems to use alot of gas, but if im gonna get more punch outta just a carb swap im all for it
    1987 Monte Carlo T-Top on 26s no lift!
    1974 Impala 58,000 org. miles for sale

  10. #9
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    yea my 74' impala had a 350... with a 4 barrel...stock intake...just got a Holley rebuilt quadrajet, updated the dist to a billet electronic,k&n air filter, and dual exhaust with the quiet flowmasters and it ran real nice....put your foot into it and it goes...
    GLASSHOUSE FIEND

  11. #10
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    if that's your car in your avatar...


    then them rims are why it doesn't go
    GLASSHOUSE FIEND

  12. #11
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    i replaced a 350 with a rebuilt 400 in my 70 impala about 10 years ago, the 400 used less gas, seemed like i stayed off the gas, and 400s have a shit load of torque
    if a bitch with big tits can work at hooters
    then why can't a hoe with one leg work at IHOP?

  13. #12
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    Quote Originally Posted by harborareaPhil View Post
    if that's your car in your avatar...


    then them rims are why it doesn't go
    It does go though
    1987 Monte Carlo T-Top on 26s no lift!
    1974 Impala 58,000 org. miles for sale

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