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Thread: carb ?
          
   
   

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  1. #1
    wrenchinrick's Avatar
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    carb ?

     



    I have a 350 chevy with these modifications.280h cam,aluminum dualplane intake.headers.I have a 4150(750 dual feed). the problem Ihave if it is a problem is the motor seems to run rich.the exhaust smells real richI donot know if this is from the bigger cam or maybe too big a carb or possibly i need to upgrade the stock hei ignition.any ideas would be appriciated

  2. #2
    Itoldyouso's Avatar
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    Go to something around 600 cfm, and I bet you will be a lot happier.


    Don

  3. #3
    erik erikson's Avatar
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    Quote Originally Posted by Itoldyouso
    Go to something around 600 cfm, and I bet you will be a lot happier.


    Don
    You beat me to it.
    Yes,go 600 cfm.

  4. #4
    Racecar100 is offline CHR Member Visit my Photo Gallery
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    The best 600 Holley ever made for 350 is # 6619 if you can find one.

  5. #5
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    Holley tuning

     



    Because of the cam change I would try going down one or two sizes on the power valve,also down two sizes on primary jets,should put you in the ballpark.

  6. #6
    erik erikson's Avatar
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    Quote Originally Posted by DennyW
    I think Jeff hit it. Sounds like you got the wrong power valve installed for the cam you have. Check the vacuum at the intake manifold and see what it is.
    If it back-fired that will blow the power-valve.

  7. #7
    HOSS429's Avatar
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    ahh .. spend 10 thousand more dollars and make the motor big enuff to fit the carb

  8. #8
    Itoldyouso's Avatar
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    Or spend $ 200 and put the correct one on it.


    Don

  9. #9
    erik erikson's Avatar
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    Quote Originally Posted by DennyW
    That's right....spend.... spend....

    What happened to fix...fix.....

    http://store.summitracing.com/egnsea...+115&y=12&x=33
    Denny,please stop.
    You sound to much like my wife and you are starting to scare me.

  10. #10
    jerry clayton's Avatar
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    Yep---why not spend $15 to fix the carb he has ? It might not be the ideal size but it can certainly be made to run better than it does

  11. #11
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    I appriciate the input.It sounds like the carb is the problem.being from mi. I have probably about 4 months to figure out to either fix or replace the carb. as far as building a motor to fit the carb I would love too.Ihave less than 4 k invested in this truck so far and have a budget to stay in.down the road I would like to tub it and put a blown big block in it.but at this time its just a dream (everyones got to have a dream)you folks seem to know your stuff

  12. #12
    460motorvator is offline CHR Member Visit my Photo Gallery
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    Does it smell till ur eyes water on idle,i have the same problem,sorry no fix,i've got a 460 with 800 hollley,big problem!

  13. #13
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    I'd get rid of the dual feed on the street, get vacuum secondaries, a 750 daul pump with mechanical secondaries is going to shove to much gas down a 350, get a 600-650 with vacuum secs, will only take what it needs, unless you have to light of a spring.
    I like Q-Jets!

    Pat
    HemiTCoupe



    Anyone can cut one up, but! only some can put it back together looking cool!
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  14. #14
    wrenchinrick's Avatar
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    denny the model is a 3310S I have purchased a 600 cfm holly and it seams to run cleaner and crisper.I havent had a chance to drive the truck on the road since I rebuilt the motor and installed new carb( too much snow in michigan)

  15. #15
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    Right out of the box . The Carter AFB (aka) Edelbrock Performer is the better 600CFM Carburetor . A Holley 1850 600CFM needs lots of work done to it . so it can give any kind of performance .

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