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Thread: Carburetor for 327
          
   
   

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  1. #1
    ZAFluffyBunny is offline CHR Member Visit my Photo Gallery
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    Carburetor for 327

     



    Hi,

    My 68 327 still has its stock Rochester Carb, and it has seen much better days. I want to replace it with the 0-Holley Street Avenger 670CFM 0-80670, but I am unsure how well matached this would be. Currently the engine is still stock, but as I get cash I am planning to upgrade.

    Any suggestions?

  2. #2
    Dave Severson is offline CHR Member/Contributor Visit my Photo Gallery
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    I'd say for a stock engine the 670 is going to be too big of a carb.... Something in the 570 to 600 CFM range would probably work a lot better. Are you changing intake manifolds, too? Not sure, but was the old Rochester the same bolt pattern as a Holley, or was it smaller???? Hopefully one of the chebbie guys will remember.
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  3. #3
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    SBC
    SBC is offline CHR Member Visit my Photo Gallery
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    My 68 327 still has its stock Rochester Carb
    What was the CFM rating for the 4bbl Rochesters?
    There is no limit to what a man can do . . . if he doesn't mind who gets the credit. (Ronald Reagan)

  4. #4
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    anything larger than a 600 and it will be stumbling all over itself. i would go with the 600, still a little large but a tunable carb for your stock motor. that way if you do upgrade the intake, and headers. you will be right where you need to be with the carb.


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  5. #5
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    southerner is offline CHR Member/Contributor Visit my Photo Gallery
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    The flow ratings for the rochesters was 600 CFM for the small blocks and 800 CRM for thje big blocks. Also the rochester is a spread bore type of carburetor whereas the Holley is a square bore type. So if you want to run a Holley you will either have to change to a square bore manifold (recommended) or use an adapter plate. Adapter plates restrict air flow and also raise the carburetor and can cause hood clearance problems. Also if you are using the stock air claner you will have to replace or modify it to fit a holley's top air horn
    "aerodynamics are for people who cant build engines"

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  6. #6
    Dave Severson is offline CHR Member/Contributor Visit my Photo Gallery
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    Is it the old 4GC Rochester, or the spread bore Quadrajet on the car????
    Yesterday is history, tomorrow is a mystery, Live for Today!
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  7. #7
    ZAFluffyBunny is offline CHR Member Visit my Photo Gallery
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    Thanks

    I believe it is currently a spread bore Manifold. I am planning to replace it with a square bore instead.

    oh well, since the 670cfm will be to big, maybe a Holley 0-1850S 600CFM instead with an Edelborck TorkerII manifold

  8. #8
    ZAFluffyBunny is offline CHR Member Visit my Photo Gallery
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    Actually, I reckon the Holley Street Dominator 300-38 manifold will be better for my application

  9. #9
    Dave Severson is offline CHR Member/Contributor Visit my Photo Gallery
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    I've had some good experiences with the Edelbrock Performer RPM intakes, too. The cam that matches the intake works good, too. I think the 600 Holley would probably be a good choice for the car.... Have fun with your project!!!
    Yesterday is history, tomorrow is a mystery, Live for Today!
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  10. #10
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    IMO the 670 Holley is not too much carb with vacuum secondaries. Some of it depends on the weight of the car and rear end and cam etc.

    If you go to the Holley site it will recommend it ...........

    Kitz
    Jon Kitzmiller, MSME, PhD EE, 32 Ford Hiboy Roadster, Cornhusker frame, Heidts IFS/IRS, 3.50 Posi, Lone Star body, Lone Star/Kitz internal frame, ZZ502/550, TH400

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    Quote Originally Posted by kitz
    IMO the 670 Holley is not too much carb with vacuum secondaries. Some of it depends on the weight of the car and rear end and cam etc.

    If you go to the Holley site it will recommend it ...........

    Kitz
    I agree with kitz.
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  12. #12
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    Quote Originally Posted by ZAFluffyBunny
    Hi,

    My 68 327 still has its stock Rochester Carb, and it has seen much better days. I want to replace it with the 0-Holley Street Avenger 670CFM 0-80670, but I am unsure how well matached this would be. Currently the engine is still stock, but as I get cash I am planning to upgrade.

    Any suggestions?
    I would try a 525 Barry Grant or a 500 cfm Edelbrock.

  13. #13
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    Big Barry Grant fan myself, never used the road demon jr, but have had nothing but good luck with the road demon, and speed demons, I'd go with the Jr.
    Objects in the mirror are losing

  14. #14
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    I swapped out my ole Carter for an: Edelbrock-Performer-600-cfm-Carb-Electric-Choke;

    http://www.martelbrothers.com/catalo...ctric-Choke-p-

    Picked mine up a SHUCKS on sale - $ 239.oo ( You have to buy their Fuel filter kint ( which takes away any perceived discounts, though )...
    ...feels like a completely different truck, 327, mild cam,

  15. #15
    kitz's Avatar
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    The Barry Grant carb ain't a bad choice either. Most any reasonable vacuum secondary carb won't bog though and it'll draw what it needs when you get it on ..........


    Yeah, well I'm a Holley dude. That said I've got an 850 vacuum speed demon on my 502. And God willing one of these days my left arm is gonna get a little better and I'm a gonna' get her goin'. If'n I don't like the Demon, well, I'll let you boys know

    Kitz
    Jon Kitzmiller, MSME, PhD EE, 32 Ford Hiboy Roadster, Cornhusker frame, Heidts IFS/IRS, 3.50 Posi, Lone Star body, Lone Star/Kitz internal frame, ZZ502/550, TH400

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