What size carb?
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What size carb?

  1. #1
    Senior Member Widetrack's Avatar
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    Default What size carb?

    What would be the best size Holley carb for a stock 454 BBC peanut port heads with an cheap air gap intake? Double pumper only! 650,750,850? This is on a jet boat. WT


    SOMEONE SAID YOU CAN'T TAKE IT WITH YOU! SO,IM BURNING IT UP ONE GALLON AT A TIME!
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  3. #2
    mo balls than $cents$ IMPATIENT 1's Avatar
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    750 not to big, not to small

    whatya building now coby?

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    Senior Member Widetrack's Avatar
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    Im looking at a new boat,you know one of those Youngbloods and plan on pulling my 496 to put in it! I have two motors to choose from one stock and one well warmed over 468 to go back in my Spectra! Trying to deside what would be best! 750 is what I thought but if I go to change anything the 850 might be better.


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  6. #4
    mo balls than $cents$ IMPATIENT 1's Avatar
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    tx18 or tx19?

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    Senior Member Widetrack's Avatar
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    Tx 19


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    go with the 850 and nothing but holley. sooner or later you`ll wish you had. i`m running a tx 19 for a lake boat that i`ve owned since 1982. if theres a better lake hull i don`t know what it is.

  9. #7
    Senior Member Widetrack's Avatar
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    Been looking for a long time! I think I have found one to get wet with! WT


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  10. #8
    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by Richard Till View Post
    go with the 850 and nothing but holley. sooner or later you`ll wish you had....
    If I may ask...
    850 DP list #9380 w/annular discharge boosters
    4-corner square jetting.
    On a 468 10:1 compression spining just over 5K
    78 jets front and back and I tried 80's-82's
    Problem...the thing falls on its face like there's a rag over the intake?
    The carb is spotless and free from debris in all ports.
    ???
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  11. #9
    Senior Member sleekvino's Avatar
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    750 plenty for a stock chevy
    PORNO RACING INC WHERE ITS "HARD" TO WIN

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    hammerdown, 80 80 should be good for that motor. Teague likes these carbs because of the soft progressive secondary, gets rid of the lean spot just before the secondaries open. something is wrong if it lays down though.

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    HammerDown, are the accelerator pump squirters giving a good shot throughout their range? whats your timming setting. i like the 80/80 jets too but you`re not far enough off to be causing problems. how bout the power valve? fuel pressure? when you rule out all of these potential problems, i`d say its back off and to the work bench.

  14. #12
    Senior Member W.O.T's Avatar
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    Get a 750 Holly mechanical secondaries. jet it correctly your good to go. put a motor together mild build 454 with a 750 vacuum carb jetted up and it runs like a dream. i wouldnt run a vacuum carb but just sayin 750 is enough for a pretty stout and mild 454.
    Last edited by W.O.T; 08-14-2009 at 01:34 AM.

  15. #13
    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Widetrack View Post
    Tx 19
    bout phucking time

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    Annular boosters are great, however a handful to tune, it just takes time and patience.

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