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  1. #1

    Default 4180 carb question

    I bought Holley kit 3-1346 and the needle and seat seem to short. Float all the way up doesn’t shut needle. What’s the correct needle and seat part number?
    Randy

  2. #2

    Default

    You need to bend the metal tang that rests against the tab of the needle and seat. This is the metal part of the float assembly. Bend it so that the float's top is about parallel with the bowl roof, and about 1/16" of thread is protruding... this puts the very top of the needle and seat about mid way of the adjusting nut...
    Mike
    1986 Mustang convertible 3.8L ---> BUILD THREAD
    1983 Mercury Cougar 3.8L LS
    1986 Ford Thunderbird 5.0L ELAN
    1966 Ford Fairlane sedan 200-6
    1966 Ford Fairlane GT (390ci 4spd)
    1981 Mercury Marquis Brougham
    1980 Capri RS Turbo
    1971 Mustang Fastback
    1974 Pontiac Luxury LeMans

  3. #3

    Default

    I’ll try again I did bend it some already. The old needles aren’t original and are longer.
    Randy

  4. #4

    Default

    Whichever... do what you need to do to make it right. It'll be fine.
    Mike
    1986 Mustang convertible 3.8L ---> BUILD THREAD
    1983 Mercury Cougar 3.8L LS
    1986 Ford Thunderbird 5.0L ELAN
    1966 Ford Fairlane sedan 200-6
    1966 Ford Fairlane GT (390ci 4spd)
    1981 Mercury Marquis Brougham
    1980 Capri RS Turbo
    1971 Mustang Fastback
    1974 Pontiac Luxury LeMans

  5. #5

  6. #6

    Default

    Yeah, idiots selling stuff... bend your float levers or lever tabs that go against the tails of the needles and seats to suit your situation and you'll be fine... and if you don't already have them, and they're not in the rebuild kit (I don't think they're in the rebuild kit), you're going to need the regular style adjusting nuts and lock screws for the needle and seat tops...
    Last edited by Walking-Tall; 05-26-2018 at 11:21 AM.
    Mike
    1986 Mustang convertible 3.8L ---> BUILD THREAD
    1983 Mercury Cougar 3.8L LS
    1986 Ford Thunderbird 5.0L ELAN
    1966 Ford Fairlane sedan 200-6
    1966 Ford Fairlane GT (390ci 4spd)
    1981 Mercury Marquis Brougham
    1980 Capri RS Turbo
    1971 Mustang Fastback
    1974 Pontiac Luxury LeMans

  7. #7
    FEP Power Member 85stanggt's Avatar
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    Nov 2005
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    Tampa, FL
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    2,166

    Default

    Are the floats Holley floats? Maybe those were changed also. The factory Holley floats' metal tang is bent at an angle, but it is slight.
    1985 Mustang GT Convertible
    Stock and original @ 213k, except for dynomax ultraflos.

  8. #8

    Default

    Floats are Holley. Had to bend a lot but I got them set.

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