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Opinions on Carbs
#1
My dad's friend has been racing dragsters since '95 and has been working on motors his entire life. My carb needed to be rebuilt and he offered to do it for me. When I was over at his house last night picking up the carb, he was talking about the 600 being too small for my motor and showed me a Carter AFB 625 with electric choke that he was willing to make me a deal on if I wanted. He was basically saying I could take it off his hands whenever I wanted. When I got home I did some research and from what I gathered Carter AFB turned into Weber and eventually Edlebrock copied the design for their current carbs. Since all of this most likely went down before I was even born, I had never heard of Carter AFB until the guy pulled the one out of a box and showed me. My initial reaction was that it looked exactly like an Edlebrock, which made sense after researching it.

So I was just wondering what your guys' opinions were on the AFBs. From what he was telling me, and what I have read, they are solid carbs.
'73 "Q-Code" Mach 1
[Image: Mt7Cz.png]
|351C-4V|Holley 600CFM|Edelbrock Manifold|Unknown Cam|10:1 Pistons|Hooker Longtubes|Glasspacks|C4 Auto|Unknown Gears|

Cold Start And Run Video: http://www.youtube.com/watch?v=Kqr4NVCHxBk
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#2
Carter/Edelbrock/Webers are good carbs. They are very sensitive to dirt and heat. You'll notice many postings over on the VMF about fuel boil overs, hot hard starts, etc with Edelbrocks. That being said, I do not see any advantage of spending money on 25CFM.

I'll agree that a 600 is probably too small, but until you get your package sorted, I probably wouldn't worry about the carb. If the one you have works fine, then I'd run it for now.

In the future, I would look at a 750CFM carb for your engine.
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#3
(11-16-2010, 02:30 PM)Hemikiller Wrote: Carter/Edelbrock/Webers are good carbs. They are very sensitive to dirt and heat. You'll notice many postings over on the VMF about fuel boil overs, hot hard starts, etc with Edelbrocks. That being said, I do not see any advantage of spending money on 25CFM.

I'll agree that a 600 is probably too small, but until you get your package sorted, I probably wouldn't worry about the carb. If the one you have works fine, then I'd run it for now.

In the future, I would look at a 750CFM carb for your engine.
Well the one I've had my eye on since starting this project was the Holley 750CFM dual feed. That's actually what was on my car before the 600CFM. But some people that I've talked to say 750CFM is slightly large for 351ci. I was also thinking about a 650CFM, either the dual feed or double pumper.

What are most of the guys here running?
'73 "Q-Code" Mach 1
[Image: Mt7Cz.png]
|351C-4V|Holley 600CFM|Edelbrock Manifold|Unknown Cam|10:1 Pistons|Hooker Longtubes|Glasspacks|C4 Auto|Unknown Gears|

Cold Start And Run Video: http://www.youtube.com/watch?v=Kqr4NVCHxBk
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#4
I've run 800cfm Holley DP carbs on my 351C-4V engines with great success. However, I run 4 speed transmissions and gearing was from 3.25 ~ 3.91, depending upon the car.

I see no issue with a 750 on a 351. If the motor is healthy and you don't have a 1200 rpm stall converter and 2.75 gears, you'll be fine.
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#5
(11-16-2010, 03:42 PM)Hemikiller Wrote: I've run 800cfm Holley DP carbs on my 351C-4V engines with great success. However, I run 4 speed transmissions and gearing was from 3.25 ~ 3.91, depending upon the car.

I see no issue with a 750 on a 351. If the motor is healthy and you don't have a 1200 rpm stall converter and 2.75 gears, you'll be fine.
With the setup in signature, what would recommend? Eventually I am going to put a T-5 in and I'm not sure what gears it has but I know they're aren't stock.
'73 "Q-Code" Mach 1
[Image: Mt7Cz.png]
|351C-4V|Holley 600CFM|Edelbrock Manifold|Unknown Cam|10:1 Pistons|Hooker Longtubes|Glasspacks|C4 Auto|Unknown Gears|

Cold Start And Run Video: http://www.youtube.com/watch?v=Kqr4NVCHxBk
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#6
I have an Holley 850 DP
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#7
750 vs here


Attached Files Thumbnail(s)
   
[Image: 25rnz1y.jpg]

~Buddy
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#8
I have a quick fuel Q series double pumper and it works great.But I also am not running a stock cam and intake.But from what I have read oN this site and other forums the Cleveland can handle a 750 very easily {have you seen the intake ports on these heads. HUGE!!!!!Tongue}

i DON'T KNOW WHY IT'S BLACK BUT CLICK ON THE IMAGE TO SEE THE PICTURE


Attached Files Thumbnail(s)
   
Eric


[Image: a58hgh.jpg]
DRIVE IT DON'T STORE IT!
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#9
So how much of a difference is there in performance between the 750 double pupmer and the single?
'73 "Q-Code" Mach 1
[Image: Mt7Cz.png]
|351C-4V|Holley 600CFM|Edelbrock Manifold|Unknown Cam|10:1 Pistons|Hooker Longtubes|Glasspacks|C4 Auto|Unknown Gears|

Cold Start And Run Video: http://www.youtube.com/watch?v=Kqr4NVCHxBk
  Reply
#10
The biggest difference will be in the lateral g forces when you accelerate.Double Pumper carbs have a slight advantage over a vacuum secondary for max acceleration. But dp carbs are a little harder to tune and less economical because you get a 4 shots instead of 2 everytime you stab the pedal
Eric


[Image: a58hgh.jpg]
DRIVE IT DON'T STORE IT!
  Reply


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