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Carb selection:Carter AFB comp. or Holly double pumper?
#917865
01/31/11 03:45 AM
01/31/11 03:45 AM
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Joined: Jan 2011
Posts: 138
Los Angeles, CA
71_dramaqueen
OP
member
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OP
member
Joined: Jan 2011
Posts: 138
Los Angeles, CA
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Ok all you carburetor gurus time to advise my ignorance; I have a purchased motor in my challenger that the owner claimed had a carb that was not suitable. He gave me another that he had bought to put on it.
The motor: 318CID, .030 over, 9.5:1 comp, purple cam with 284/284 duration and .484/.484 lift. (and a drilled through Eddlebrock performer manf. if it makes any difference)
The original carb: A Holley double pumper ( List # 4777-5). From what i have gathered its a 650 cfm with mech. secondary.
New carb: Carter AFB Comp. series (9636). Again from what i have gathered this is a 625 cfm with vacuum secondary and designed for mopars.
So my question is should I make the swap and why? The difference in the secondarys seems to me the biggest reason to make the swap because the motor is backed with a 904.
Last edited by 71_dramaqueen; 01/31/11 04:07 AM.
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Re: Carb selection:Carter AFB comp. or Holly double pumper?
[Re: Cudajon]
#917867
01/31/11 03:17 PM
01/31/11 03:17 PM
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Joined: Apr 2007
Posts: 2,327
Glendale, AZ
69L78Nova
Banned. Forever.
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Banned. Forever.
Joined: Apr 2007
Posts: 2,327
Glendale, AZ
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Id be more concerned about the 284/484 cam, and the rest of the combo. But id go with the AFB
1969 Nova
454/M21/3.31
Mild mid-11 second weekend cruiser
1994 F150 XLT Super Cab 2WD
5.0/4R70W/3.55
(Daily driver)
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Re: Carb selection:Carter AFB comp. or Holly double pumper?
[Re: 69L78Nova]
#917868
01/31/11 07:17 PM
01/31/11 07:17 PM
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Joined: Jun 2004
Posts: 893
Tustin, CA
pishta
super stock
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super stock
Joined: Jun 2004
Posts: 893
Tustin, CA
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904 go with the carter, jet it and forget it. 833... go with the DP as you have more control over the RPM's with a stick.
12 Grand Caravan
06 T&C
02 T&C
96 Breeze
65 Barracuda "S"
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Re: Carb selection:Carter AFB comp. or Holly double pumper?
[Re: 69L78Nova]
#917871
01/31/11 09:09 PM
01/31/11 09:09 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Id be more concerned about the 284/484 cam, and the rest of the combo. But id go with the AFB
ditto. I'd think the DP would work fine. If you have tuning issues it's more likely the 484 cam. They like compression, stall and gear. If you are trying to tune a 9:1 318 w/ a stock stall and 3.23 gears you'd be miles ahead swaping the cam out. 
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so I'll begin. Either carb will work if set up correctly, period. Personally I like the Carter since its easily tunable with metering rods and springs, but that is just my 