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#721969 - April 01st 2017 6:52 pm Carb recommendation ?  
Joined: Jul 2016
Posts: 81
BlairW Offline
journeyman
BlairW  Offline
journeyman

Joined: Jul 2016
Posts: 81
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
#721973 - April 01st 2017 11:11 pm Re: Carb recommendation ? [Re: BlairW]  
Joined: Sep 2005
Posts: 8,078
CatFish Offline
carpal tunnel
CatFish  Offline
carpal tunnel

Joined: Sep 2005
Posts: 8,078
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%.

#722069 - April 04th 2017 5:46 pm Re: Carb recommendation ? [Re: CatFish]  
Joined: Jul 2016
Posts: 81
BlairW Offline
journeyman
BlairW  Offline
journeyman

Joined: Jul 2016
Posts: 81
Saskatchewan
No one runs a carburated van here?


1979 Nomad
2005 E350 Cutaway Class C
#722072 - April 04th 2017 5:55 pm Re: Carb recommendation ? [Re: BlairW]  
Joined: Aug 2001
Posts: 11,282
Reed Offline
Maniac
Reed  Offline
Maniac

Joined: Aug 2001
Posts: 11,282
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!
#722134 - April 05th 2017 9:55 pm Re: Carb recommendation ? [Re: BlairW]  
Joined: Apr 2013
Posts: 103
Reese Offline
member
Reese  Offline
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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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#722141 - April 05th 2017 10:41 pm Re: Carb recommendation ? [Re: BlairW]  
Joined: Nov 2013
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Dyno_Dave Offline
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Dyno_Dave  Offline
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Joined: Nov 2013
Posts: 1,725
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]

#722159 - April 06th 2017 3:04 pm Re: Carb recommendation ? [Re: Dyno_Dave]  
Joined: Jul 2016
Posts: 81
BlairW Offline
journeyman
BlairW  Offline
journeyman

Joined: Jul 2016
Posts: 81
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
#722175 - April 06th 2017 7:30 pm Re: Carb recommendation ? [Re: BlairW]  
Joined: Nov 2013
Posts: 1,725
Dyno_Dave Offline
veteran
Dyno_Dave  Offline
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Joined: Nov 2013
Posts: 1,725
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.)

#722176 - April 06th 2017 7:35 pm Re: Carb recommendation ? [Re: BlairW]  
Joined: Aug 2001
Posts: 11,282
Reed Offline
Maniac
Reed  Offline
Maniac

Joined: Aug 2001
Posts: 11,282
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!
#722225 - April 07th 2017 7:59 pm Re: Carb recommendation ? [Re: BlairW]  
Joined: Nov 2013
Posts: 1,725
Dyno_Dave Offline
veteran
Dyno_Dave  Offline
veteran

Joined: Nov 2013
Posts: 1,725
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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