sbc carb sizing ??
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  1. #1
    Official RnS Addict chris's Avatar
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    sbc carb sizing ??

    hey guys,

    whats the opinion of carb sizes for a 350 chevy fitted with edelbrock intake (i forget which one!!), accel leccy dizzy, headers and a cam of uncertain lumpiness ??

    the engine is in great shape with good compression across all cylinders, excellent oil pressure, no air leaks etc etc

    i appreciate that its a 'how longs a bit o string' question without a definate answer but a ballpark size would do at this point,

    the reason i ask is that it has the above plus an ebelbrock carb (1405 which iv been told is a 600cfm) and it seems to lack the 'go' my last camaro had with an almost identical set up other than the carb which was a 750 holley

    is a 600 just too small ????

    cheers
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    Got salt Briz's Avatar
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    600 is about right unless you want to rev the ******** off it.
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    Rods 'n' Sods Junkie
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    I have a 650 double pumper quick response.
    Checked emissions C02 last week
    Result was 1.5% on one bank 1.6 % on the other.
    Separated exhust system .
    Last edited by Smokey; 14-06-2015 at 18:32.
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    Rods 'n' Sods Junkie
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    Test or Kill is online now
    600 is fine, hotter engine may respond to more carb but will drive better with smaller carb.
    Cheers, Martin
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  7. #5
    The Camino Kid Britdragster's Avatar
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    I had a Holley 600 on mine for years as it was what came with the car and ya know how it is, aint broke so why fix it?, but a couple of years ago I noticed the main shaft was bent meaning it was sticking and therefore dangerous so I was in the same position you're in now. I didn't want to or feel the need to go much bigger than what I had so opted for the Holley 670 Street Avenger. I tell ya what, it woke the old girl up like setting fire to her britches. I have pretty much the same set up as you so that's what I'd recommend. Hope this helps somewhat, Rog.
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    Rods 'n' Sods Junkie
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    Quote Originally Posted by Britdragster View Post
    I had a Holley 600 on mine for years as it was what came with the car and ya know how it is, aint broke so why fix it?, but a couple of years ago I noticed the main shaft was bent meaning it was sticking and therefore dangerous so I was in the same position you're in now. I didn't want to or feel the need to go much bigger than what I had so opted for the Holley 670 Street Avenger. I tell ya what, it woke the old girl up like setting fire to her britches. I have pretty much the same set up as you so that's what I'd recommend. Hope this helps somewhat, Rog.
    have to agree
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  9. #7
    Official RnS Addict chris's Avatar
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    thanks for the replys guys

    i think ill see if i can borrow a known 'good' holley (etc) and try before i spend more £ on something i dont need

    it may well be as its sposed to be 'as is' it just feels like it wants to give more but cant - if you know what i mean......

    and its exhaust is suprisingly quiet too which may or may not be something to do with it (with hooker headers straight through to 2 rear boxes id have expected it to make more of a racket)

    i dont need to use it much so mpg's are not a huge concern, it just needs to be a bit nippier
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    Administrator blackpopracing's Avatar
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    Or go for an Edelbrock Thunder series 650 - nice carb and mine seems to go nicely with one and its not even set up properly yet.
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    Official RnS Addict Stude Star's Avatar
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    I'd go with a 650 vac sec. Gives you a bit of room for future upgrades. I've got a 650 on the Stude and a 750 on the Vette. Both SBC's. The Stude is defo getting fuel starvation at WOT in 3rd going through the traps running 13.99 although this is probably a jetting issue rather than carb sizing. It's revs more so than engine size that warrants a bigger carb.
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  12. #10
    Rods 'n' Sods Junkie boblester40's Avatar
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    What heads does the 350 have on it , this will be the most defining thing in relation to the power output , chances your old motor had better heads on it ?

    cheers
    bob
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