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Carb recommendation ? #721969
April 01st 2017 6:52 pm
April 01st 2017 6:52 pm
Joined: Jul 2016
Posts: 93
Saskatchewan
BlairW Offline OP
journeyman
BlairW  Offline OP
journeyman
Joined: Jul 2016
Posts: 93
Saskatchewan
79 G20, with a 400/TH350. Currently has a 750 CFM Holley 4160, and a Weiand single plane. Cruises great but seems like the wrong combo for a big heavy van.

Want to go to a dual plane and a smaller carb. What are you guys running?


1979 Nomad
2005 E350 Cutaway Class C
Re: Carb recommendation ? [Re: BlairW] #721973
April 01st 2017 11:11 pm
April 01st 2017 11:11 pm
Joined: Sep 2005
Posts: 8,353
Georgia, USA
CatFish Offline
carpal tunnel
CatFish  Offline
carpal tunnel
Joined: Sep 2005
Posts: 8,353
Georgia, USA
Originally Posted by BlairW
79 G20, with a 400/TH350. Currently has a 750 CFM Holley 4160, and a Weiand single plane. Cruises great but seems like the wrong combo for a big heavy van.
Want to go to a dual plane and a smaller carb. What are you guys running?


All mine are currently EFI, but I can tell from years of past carb experience the 750 and the single plane are not the best choice. The two make their best power at much too high an RPM for efficient street use.
A dual plane will increase air flow velocity at lower RPMs and, coupled with a smaller carb, will fill the cylinder much better with an air/fuel mixture much closer to optimum at normal cruising speeds.
My 2%.


They can have my fried bologna sandwich when they pry it from my cold dead hands.
Re: Carb recommendation ? [Re: CatFish] #722069
April 04th 2017 5:46 pm
April 04th 2017 5:46 pm
Joined: Jul 2016
Posts: 93
Saskatchewan
BlairW Offline OP
journeyman
BlairW  Offline OP
journeyman
Joined: Jul 2016
Posts: 93
Saskatchewan
No one runs a carburated van here?


1979 Nomad
2005 E350 Cutaway Class C
Re: Carb recommendation ? [Re: BlairW] #722072
April 04th 2017 5:55 pm
April 04th 2017 5:55 pm
Joined: Aug 2001
Posts: 11,617
Fircrest, WA
Reed Online content
Maniac
Reed  Online Content
Maniac
Joined: Aug 2001
Posts: 11,617
Fircrest, WA
If I were running a 400 CI engine with a dual plane intake, I would go with an Edelbrock 500 CFM AVS carburetor, number 1801.


Windows- they're what make a van worth owning!
Re: Carb recommendation ? [Re: BlairW] #722134
April 05th 2017 9:55 pm
April 05th 2017 9:55 pm
Joined: Apr 2013
Posts: 103
SC
Reese Offline
member
Reese  Offline
member
Joined: Apr 2013
Posts: 103
SC
I run the factory Rochester 4 barrel. I rebuilt it myself and my van runs really well with it. The Rochester has small primaries and large secondaries the key is getting the spring tension correct on the secondary air valves. It takes two hands and the trial/error method. When dialed in, there's no "quadra-bog" and most were 650 just a few were 850 IIRC.

I'm in the process of upgrading to a Edelbrock Performer (dual plane) intake for more low end grunt. Its designed to work from idle up to about 3500 rpm if memory serves. I don't plan on winding my small block any higher than that, so a single plane would not be the best choice. Just my experience.



Reese

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http://www.montecarlo-restoration.com

"I got cuttin' torches and a welder, whaddya mean it don't fit!?"
Re: Carb recommendation ? [Re: BlairW] #722141
April 05th 2017 10:41 pm
April 05th 2017 10:41 pm
Joined: Nov 2013
Posts: 2,417
Michigan
Dyno_Dave Offline
veteran
Dyno_Dave  Offline
veteran
Joined: Nov 2013
Posts: 2,417
Michigan
Nope, EFI here.

I agree with Catfish....current combo has to go. The Q-jet is always a great option, as Reese mentions.

If I were buying a new carb, I'd be interested in a new Holley Street Demon. I'm an old Carter ThermoQuad fan, and this is a TQ-inspired update on that classic design.

HOLLEY STREET DEMON

[Linked Image]

Re: Carb recommendation ? [Re: Dyno_Dave] #722159
April 06th 2017 3:04 pm
April 06th 2017 3:04 pm
Joined: Jul 2016
Posts: 93
Saskatchewan
BlairW Offline OP
journeyman
BlairW  Offline OP
journeyman
Joined: Jul 2016
Posts: 93
Saskatchewan
I think i can pick up an older Edelbrock performer intake on the cheap, so thats step 1, ive been offered an old Thermoquad off a dodge truck, might give it a try if i can sort out the linkage. Failing that ill likely look for a edelbrock around 600CFM? Had one on a mopar 360 and it was great, set it and forget it. Mostly just looking for opinions on what CFM i should be looking for.


1979 Nomad
2005 E350 Cutaway Class C
Re: Carb recommendation ? [Re: BlairW] #722175
April 06th 2017 7:30 pm
April 06th 2017 7:30 pm
Joined: Nov 2013
Posts: 2,417
Michigan
Dyno_Dave Offline
veteran
Dyno_Dave  Offline
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Joined: Nov 2013
Posts: 2,417
Michigan
I'd say anywhere form 600 to 750 can work nicely on a 350. Just depends on the rest of the build (heads, cam, C/R, headers, etc.)

Re: Carb recommendation ? [Re: BlairW] #722176
April 06th 2017 7:35 pm
April 06th 2017 7:35 pm
Joined: Aug 2001
Posts: 11,617
Fircrest, WA
Reed Online content
Maniac
Reed  Online Content
Maniac
Joined: Aug 2001
Posts: 11,617
Fircrest, WA
Don't go too big on the CFM. On a street driven van with a 400 c.i. motor, a 500 CFM carb is just right. AVS is better than the Edelbrock Performer since you can adjust the timing of the air door opening on the secondaries. I also prefer Edelbrock carbs over Holleys for the simplicity and ease of adjustment.


Windows- they're what make a van worth owning!
Re: Carb recommendation ? [Re: BlairW] #722225
April 07th 2017 7:59 pm
April 07th 2017 7:59 pm
Joined: Nov 2013
Posts: 2,417
Michigan
Dyno_Dave Offline
veteran
Dyno_Dave  Offline
veteran
Joined: Nov 2013
Posts: 2,417
Michigan
Opinions on carbs = Bellybuttons. Everybody has one.

I respect Reed, but disagree with his assessment on the CFM requirements of an SBC. grin cheers

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