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  1. #1
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    Default Carter AFB heat isolator

    My "63, 340 HP has a Carter 3461s carb, and gas is boiling when I shut it off. Heat riser is out. I am looking for a 1/4" thick phenolic spacer. Any ideas or better yet part #'s. Thanks, Frank

  2. #2
    Administrator Tom Bryant's Avatar
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    I found this Canton Racing Products one on Summit for square bore carbs Canton Racing Carburetor Spacers 85-154

    Doesn't say if it fits both Holley and AFB. I'd call and ask.

    Do you have the intake manifold carb heat passages blocked? I have read where some with 340 horse engines had drivability issues after about 20 minutes of drivingwith both sides blocked. Others say no problem. Some suggest only blocking one side. I have has AFB cars on both aluminum and iron intakes with the heat passzges blocked and never had a problem with drivability.

    Many aftermarket performance intake gaskets come with the heat passage block off plates. I see some in Summit have them and some don't.

    Tom
    NCRS 1360.............SACC 2082.............C1 Registry..............L81 Registry
    1959 Chevrolet Corvette 1981 Chevrolet Corvette , 350 L81 automatic Frost Beige

  3. #3
    Carter AFB heat isolator c5vetter's Avatar
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    check the following link as he advertises he has one available

    Carter AFB Holley Dual Pattern Phenolic
    2007 BMW M6 "SYLVIA"
    2016 Black/yellow accent C7.R Z06 "ROSA"

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    Quote Originally Posted by Tom Bryant View Post
    I found this Canton Racing Products one on Summit for square bore carbs Canton Racing Carburetor Spacers 85-154

    Doesn't say if it fits both Holley and AFB. I'd call and ask.

    Do you have the intake manifold carb heat passages blocked? I have read where some with 340 horse engines had drivability issues after about 20 minutes of drivingwith both sides blocked. Others say no problem. Some suggest only blocking one side. I have has AFB cars on both aluminum and iron intakes with the heat passzges blocked and never had a problem with drivability.

    Many aftermarket performance intake gaskets come with the heat passage block off plates. I see some in Summit have them and some don't.

    Tom
    Thanks Tom, but it is not a square bore carb. I have spent several hours on the phone with Summit, Jeggs, Trans-Dapt, etc. So far,it looks like I am going to buy a blank, 3/8" thick piece of composite and make my own. Thanks again, Frank
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    Default One that fits

    [QUOTE=c5vetter;1190840]check the following link as he advertises he has one available



    Carter WCFB Insulator

    This is usually the one that is used.


    Thanks,


    Ben

    On Saturday, June 16, 2018, Frank <dtaz79@ptd.net> wrote:
    Hello. I have a Carter # 3461S, Corvette, 340HP. Will your CAFB 250 fit this? CC across front mounting holes is 4-1/4”, front to rear is 5-1/8” Thanks, Frank




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    I'd get the intake off and block the exhaust heat passage under the manifold.

    With the heat riser passage blocked you may experience cold drivability problems but, just let the engine warm up a bit before you drive it.

    You also can add your spacer but keep in mind that raising the carb up decreased hood clearance.
    Hib Halverson

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