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Thread: Alchol carb help

  1. #1
    Member MASTER JOURNEYMAN
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    Alchol carb help

    I have a 3550 lb 67 Chevelle with a 477ci BBC with a 400th and a 411 gear.It runs awesome but burns way to much alchol, sometimes 4 gallons a pass,1/8th mile,It looks to be about a 850 carb and would like to know if anyone has any idea of what jets should be in it? It dynoed 715 horses at the wheel..I changed the oil after about 10 passes and it had about 3 gallons of alchol in it.


    thanks

  2. #2
    Senior Member RACING JUNKIE
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    Re: Alchol carb help

    Quote Originally Posted by nova2206
    I have a 3550 lb 67 Chevelle with a 477ci BBC with a 400th and a 411 gear.It runs awesome but burns way to much alchol, sometimes 4 gallons a pass,1/8th mile,It looks to be about a 850 carb and would like to know if anyone has any idea of what jets should be in it? It dynoed 715 horses at the wheel..I changed the oil after about 10 passes and it had about 3 gallons of alchol in it.


    thanks

    What brand is it ?

    168-174 jet is where I'd be, 1 1/4 turns out on idle screws. Your using wayy to much alky for sure.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
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    Lanning Electric
    Complete Drag Car Wiring
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  3. #3
    Senior Member RACING JUNKIE curtisreed's Avatar
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    468 W/850 Rupert 168'S. Same engine w/ 950 HOLLEY HP 172'S. Right around 700hp. Maybe 2 gallons 1/8 mile. Long drive back to the pits from the end at our track. Look real hard at the needle and seats, regulator all of that. Is this a belt drive pump or electric?

    Curtis

  4. #4
    Member MASTER JOURNEYMAN
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    It's a Holly, I know the front has 180s but havn't took the back off, there either the same or bigger..The system is fed through electric pumps.It has APD fuel blocks so where can I get jets for these?

  5. #5
    Senior Member RACING JUNKIE
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    #3 gallons plus the oil? WTH? You must had to have been real close to hydralicing that motor man. You got lucky on that one.

    Slap some 168's in that carb square and be done. >Cp
    ***IN GOD WE TRUST***

  6. #6
    Senior Member RACING JUNKIE
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    Quote Originally Posted by nova2206
    It's a Holly, I know the front has 180s but havn't took the back off, there either the same or bigger..The system is fed through electric pumps.It has APD fuel blocks so where can I get jets for these?
    It has apd fuel blocks ? APD does use a holley main body are you sure its not a APD carb ? Is it over powering the needle and seats leaking into the motor at idle ? The carb will take a std holley jet. I'd put 168;s in both and go.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  7. #7
    Member MASTER JOURNEYMAN
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    Yeah it's a holly with apd blocks..I'll try to find some jets..

  8. #8
    Senior Member RACING JUNKIE
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    Quote Originally Posted by nova2206
    Yeah it's a holly with apd blocks..I'll try to find some jets..
    odds are its a APD then because they dont sell just the blocks. Where is the idle screws set at ?
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  9. #9
    Member MASTER JOURNEYMAN
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    No it clearly says HOLLEY on both ends..Probably go to gas, I have a fairly new 1000+ Holley ready to go,Thanks for the help.

  10. #10
    Senior Member RACING JUNKIE
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    Quote Originally Posted by nova2206
    No it clearly says HOLLEY on both ends..Probably go to gas, I have a fairly new 1000+ Holley ready to go,Thanks for the help.
    On the sides of the metering blocks does it say APD and on the carb itself says holley ?

    we can get this right if u want to work with it.
    Answers the next few questions
    Fuel Pressure
    Timing
    Air bleeds
    Idle Mixture Screw setting
    rear jet
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com


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