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  1. #1

    Question Are two carburetors needed?

    I've noticed some older muscle cars with big blocks utilize two four barrel carburetors for fuel distribution. Is that really necessary? Considering back when NASCAR used carburetors, it was only ONE four barrel carburetor per engine...

  2. #2

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    It depends on what you're trying to do. You're going to be able to pump in more air with 2 of them. There were also some that came with 3 2-barrel carbs, and then there are the independent throttle bodies as well. Also, 60s muscle cars were all built during the 'baby boom' era, when there was no care in the world about what gas prices were, or that we'd ever run out of oil, or burn the atmosphere to a crisp. A lot of it was just done, simply becuase it could be done.

  3. #3

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    Me n my dad rarely use a dual carb set up. One 780 Holley will get you all the power you need. My dad did own a 572 dual quad set up and that Chevelle would go.
    2009 chevy 1500 z71 4x4
    2.5 ccm level,2.5 inch rear blocks 305/60/18 coopers stt,Debadged,10 series flow w/dual exit in front or right rear tire, KN CAI, diablo InTune, 18% tint all the way around ,spec-d euro headlights with black housings,winjet smoke LED tail lights,putco LED third brake light smoked, fab fours front bumper with 10k warn winch, RK sports ram air hood
    1965 c10 swb, zz4 350 with the hot cam and fast burn heads and a 780 Holley on top, richmond super street 5 speed,restorod

  4. #4

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    Quote Originally Posted by ahmitchell1 View Post
    My dad did own a 572 dual quad set up and that Chevelle would go.
    I am drooling LOL.... 572... OH YEAH!! I bet that Chevelle would indeed "scoot." But I just thought that two carburetors were a bit much... But like with so much else with automotive set up, it depends on application.

  5. #5

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    Also, thanks for the replies!!!

  6. #6

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    Got to drive that car very few times in my life. Learned how to handle a car that can't hold tires in that thing
    2009 chevy 1500 z71 4x4
    2.5 ccm level,2.5 inch rear blocks 305/60/18 coopers stt,Debadged,10 series flow w/dual exit in front or right rear tire, KN CAI, diablo InTune, 18% tint all the way around ,spec-d euro headlights with black housings,winjet smoke LED tail lights,putco LED third brake light smoked, fab fours front bumper with 10k warn winch, RK sports ram air hood
    1965 c10 swb, zz4 350 with the hot cam and fast burn heads and a 780 Holley on top, richmond super street 5 speed,restorod

  7. #7

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    Quote Originally Posted by ahmitchell1 View Post
    Got to drive that car very few times in my life. Learned how to handle a car that can't hold tires in that thing
    I can imagine so. How much power and torque was that beast putting to the rear wheels (or what was left of 'em afterwards). Sounds like that's what I would call a "car."

  8. #8

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    Quote Originally Posted by Big_Mike View Post
    I've noticed some older muscle cars with big blocks utilize two four barrel carburetors for fuel distribution. Is that really necessary? Considering back when NASCAR used carburetors, it was only ONE four barrel carburetor per engine...
    Oh, I just had to chime in. Oh, yeah... 2 four barrels are ABSOLUTELY NECESSARY. *Grunt Grunt*

    Just like my performance tune is, and that Cold Air Intake, and Performance Muffler.

    *grin*

    Like many performance gains, more fuel in = more power out. Two carbs is better than one, in that department. My guess is, though that at WOT, that sucker measured gallons per mile! LOL

    Nascar wasn't about sucking fuel down, it was about optimal power to longevity. Got to go around the track more than once, you know? But going from stoplight to stoplight, or sprint track racing? That's a whole other story!

    -Skippy.
    2006 Vortec Max 1500
    Performance:
    -Custom Tune (389HP 440 Ft/lbs Trq - Dyno'd) | Volant CAI | Magnaflow Dual-in/out Exhaust w/3" stainless pipe tips | Fully Built Transmission w/ Red Eagle Clutches & Kolene Steels w/ Corvette Servos and Stage2 Shift Kit | 35K Tranny Cooler | Mobil 1 | Royal Purple Rear Diff
    Other:
    -Spray-in Bed Liner
    -Premium Sound w/lifetime Satellite Radio | Leather | Sunroof | Heated Seats
    -Limbstriping from USING the truck (those are badges of honor)

  9. #9

    Default

    Quote Originally Posted by Big_Mike View Post
    I can imagine so. How much power and torque was that beast putting to the rear wheels (or what was left of 'em afterwards). Sounds like that's what I would call a "car."

    It was close to 750 ft/lb. my dad can be very sneaky with the dyno,especially when I started racing him. The day my cobra beat him in a straight line was the day he realized how amazing forced induction and fuel injection is and has started to use it a lot more. I think he knew he'd lose and wanted to make a 16 year old kid happy cuz he built both motors.Not to fair of a race my track car isn't street legal by any means He ran a 13 wide on the back of it btw and your right there was not a lot left afterwards
    2009 chevy 1500 z71 4x4
    2.5 ccm level,2.5 inch rear blocks 305/60/18 coopers stt,Debadged,10 series flow w/dual exit in front or right rear tire, KN CAI, diablo InTune, 18% tint all the way around ,spec-d euro headlights with black housings,winjet smoke LED tail lights,putco LED third brake light smoked, fab fours front bumper with 10k warn winch, RK sports ram air hood
    1965 c10 swb, zz4 350 with the hot cam and fast burn heads and a 780 Holley on top, richmond super street 5 speed,restorod

  10. #10

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    I run 2 750 double pumpers on my blown 327. When you are running a 1/4 mile you can actually watch the fuel guage move, it's like flushing a toilet.
    Ford has a better idea! Drive a GM!

    07 GMC Sierra Classic
    07 Honda Accord EX-L

    68 Camaro (blown)
    2011 Ford F550 V10
    I don't own this truck, I just drive it!

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