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12-29-2005, 12:09 PM
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#1 |
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Registered User
Join Date: Nov 2001
Location: Moneta, VA USA
Posts: 3,088
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Carb CFM Info Needed
Trying to find out the CFM difference between a Rochester 2-Barrel on a 307 compared to a Rochester 2-Barrel on a 350. This is for my '72 C-10. Any info would be appreciated.
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12-29-2005, 01:42 PM
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#2 |
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Registered User
Join Date: Feb 2005
Location: Bay Area, California
Posts: 995
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Re: Carb CFM Info Needed
Yeah Id be interested to know too, I have the rochester 2g on my 307 - I have never known its rating....
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1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree |
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12-30-2005, 10:16 PM
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#3 |
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Registered User
Join Date: Nov 2001
Location: Moneta, VA USA
Posts: 3,088
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Re: Carb CFM Info Needed
Guesses are also welcome.
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01-02-2006, 12:42 PM
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#4 |
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Registered User
Join Date: Feb 2005
Location: Bay Area, California
Posts: 995
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Re: Carb CFM Info Needed
Ah, one of the great mysteries of the universe...
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1971 Chevy C10 Shortbed Stepside, 307v8 3-on-the-tree |
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01-02-2006, 07:49 PM
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#5 | |
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Registered User
Join Date: Nov 2001
Location: Moneta, VA USA
Posts: 3,088
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Re: Carb CFM Info Needed
Quote:
In the meantime I was talking to National Carb down in FL and his opinion was that there wasn't much if any difference between the two. If I do find out the exact or approx CFM, I'll let you know. Bill |
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01-02-2006, 11:14 PM
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#6 |
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Registered User
 Join Date: Jul 2000
Location: Hampton, Ga, USA
Posts: 217
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Re: Carb CFM Info Needed
According to my info :
1 3/32 in. venturi cfm is 278 1 3/16 venturi 352 1 1/4 venturi 381 1 5/16 venturi 423 1 3/8 venturi 435 could use any of these on any V8
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68 Short Stepside, 350, quadrajet, 700r4, 3:73 posi, power front discs, HEI, Factory Air, Tilt, Tach, accelerator cable instead of rod, sway bar. 96 Impala SS 97 Monte Carlo |
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01-02-2006, 11:52 PM
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#7 |
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Registered User
Join Date: Nov 2001
Location: Moneta, VA USA
Posts: 3,088
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Re: Carb CFM Info Needed
Appreciate the info Don.
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01-03-2006, 12:29 AM
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#8 |
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Registered User
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
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Re: Carb CFM Info Needed
If you're going to compare them to a 4-bbl carb, don't forget that 2-bbl carbs are rated at twice the pressure drop (suction) as 4-bbls, so you have to multiply the 2-bbl rating by 0.707 to get a figure that compares to a 4-bbl's rating.
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