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Thread: need carb tunning suggestions
          
   
   

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  1. #1
    383strokerTA is offline CHR Member Visit my Photo Gallery
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    need carb tunning suggestions

     



    First of all bear with me, this is my first time doing this. Here is what I am running: 383 sbc that is internally balanced, Eagle 5140 rods and crank, Kb hypereutectic flat top pistons w/ valve reliefs, 10-1 compression, Comp cam XE274
    Product Line: COMP Cams Xtreme Energy Camshafts
    Part Type: Camshafts
    Cam Style: Hydraulic flat tappet
    Basic Operating RPM Range: 1,800-6,000
    Intake Duration at 050 inch Lift: 230
    Exhaust Duration at 050 inch Lift: 236
    Duration at 050 inch Lift: 230 int./236 exh.
    Advertised Intake Duration: 274
    Advertised Exhaust Duration: 286
    Advertised Duration: 274 int./286 exh.
    Intake Valve Lift with Factory Rocker Arm Ratio: 0.487 in.
    Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.490 in.
    Valve Lift with Factory Rocker Arm Ratio: 0.487 int./0.490 exh. lift
    Lobe Separation (degrees): 110
    Intake Valve Lash: 0.000 in.
    Exhaust Valve Lash: 0.000 in.
    Computer Controlled Compatible: No
    Grind Number: CS XE274H-10

    Pro topline 72cc aluminum heads w/ angel plugs, crane 1.52 roller tip rockers, Edelebrock RPM air gap intake, Mallory Distributor and a MSD 6A box and plug wires, my trans is a turbo 350 with a 2500-2800 stall.

    The Carb I have is a 750 Holley w/ vacuum secondaries and an electric choke, I believe it is the 4160 model. What I need is some info for setting up this carb to run with my engine combo i.e., jet sizes, squirter, cam profile, ect. Right now the engine is running rich and bogs down when you try to rev the engine quickly. The carb was bought used and my buddy rebuilt it and now we just have to tune it. If some more info is needed let me know and I will post it once I get it. I am not expecting the perfect combo from this post, but I would like to be in the ball park with the first changes that I try.

  2. #2
    nitrowarrior's Avatar
    nitrowarrior is offline CHR Member Visit my Photo Gallery
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    List number on carb is a what? That would help start the info. Did you put a vacuum gauge on it and if so, what did it read at idle?
    What if the "Hokey Pokey" is what it's really all about?

  3. #3
    383strokerTA is offline CHR Member Visit my Photo Gallery
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    its a model 4160 list 3310-2, vac was 18" once the idle mix was set. it;'s timed to 11-12 degrees BTDC

  4. #4
    oldtrucker is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 65Ford F100 ,89chev caprice,65Chevy C10
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    check the size of the jets since you got it used i would probably start with 66,s and go from there
    I just wonder what happened to GOVERNMENT of the people by the people for the people?

  5. #5
    NTFDAY's Avatar
    NTFDAY is offline CHR Member Visit my Photo Gallery
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    First, I believe that you are over carbed. IMHO you don't have enough cam and cubic inches to support a 750. If the stock 72 jets are in the carb I'd drop them to 64's and go from there. What you need is a book such as the one below which will take you step by step on how to tune a Holley.
    Attached Images
    Ken Thomas
    NoT FaDe AwaY and the music didn't die
    The simplest road is usually the last one sought
    Wild Willie & AA/FA's The greatest show in drag racing

  6. #6
    nitrowarrior's Avatar
    nitrowarrior is offline CHR Member Visit my Photo Gallery
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    Be cautious on going too lean too quickly. The boosters and venturi square area needs to stay within a certain range to keep airfuel ratios within a runnable situation.
    What if the "Hokey Pokey" is what it's really all about?

  7. #7
    skids72's Avatar
    skids72 is offline CHR Member Visit my Photo Gallery
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    Car Year, Make, Model: 68 Firebird 439 BBC
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    I agree... should stick close to stock jetting for a start and move from there. Being over-carbed "shouldn't" affect the a/f but the throttle response won't be as crisp... I don't think the 750 on this 383 is overkill but a 650 would probably give better response (though the vac secondaries should help this situation...)

    Disclaimer: I've been proven wrong more than I care to admit!

    Two cents,

    -Chris

  8. #8
    nitrowarrior's Avatar
    nitrowarrior is offline CHR Member Visit my Photo Gallery
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    Disclaimer: I've been proven wrong more than I care to admit!

    Two cents,

    -Chris[/QUOTE]

    Amen brother....We all have to go thru that once in a while. That's how we learn how not to do it...
    What if the "Hokey Pokey" is what it's really all about?

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