Vanning.com logo
Boxdin
Site Navigation


Advertisements
Recent Posts
Good day
by SDMickey - March 27th 2024 10:55 pm
Crazy mods
by frscke1 - March 27th 2024 9:37 pm
Lew Greger
by MufflerMan Mike - March 27th 2024 5:15 pm
1987 G20 Gypsy
by SDMickey - March 25th 2024 9:39 pm
Featured Links


Previous Thread
Next Thread
Print Thread
Rate Thread
Page 1 of 2 1 2
Carb recommendation ?
#721969 April 01st 2017 6:52 pm
Joined: Jul 2016
Posts: 96
BlairW Offline OP
journeyman
OP Offline
journeyman
Joined: Jul 2016
Posts: 96
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 ?
BlairW #721973 April 01st 2017 11:11 pm
Joined: Sep 2005
Posts: 9,855
Likes: 234
carpal tunnel
Offline
carpal tunnel
Joined: Sep 2005
Posts: 9,855
Likes: 234
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%.

Re: Carb recommendation ?
CatFish #722069 April 04th 2017 5:46 pm
Joined: Jul 2016
Posts: 96
BlairW Offline OP
journeyman
OP Offline
journeyman
Joined: Jul 2016
Posts: 96
No one runs a carburated van here?


1979 Nomad
2005 E350 Cutaway Class C
Re: Carb recommendation ?
BlairW #722072 April 04th 2017 5:55 pm
Joined: Aug 2001
Posts: 12,107
Likes: 37
Maniac
Offline
Maniac
Joined: Aug 2001
Posts: 12,107
Likes: 37
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 ?
BlairW #722134 April 05th 2017 9:55 pm
Joined: Apr 2013
Posts: 104
member
Offline
member
Joined: Apr 2013
Posts: 104
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

[Linked Image]

http://www.montecarlo-restoration.com

"I got cuttin' torches and a welder, whaddya mean it don't fit!?"
Re: Carb recommendation ?
BlairW #722141 April 05th 2017 10:41 pm
Joined: Nov 2013
Posts: 3,692
Likes: 32
pooh-bah
Offline
pooh-bah
Joined: Nov 2013
Posts: 3,692
Likes: 32
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 ?
Dyno_Dave #722159 April 06th 2017 3:04 pm
Joined: Jul 2016
Posts: 96
BlairW Offline OP
journeyman
OP Offline
journeyman
Joined: Jul 2016
Posts: 96
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 ?
BlairW #722175 April 06th 2017 7:30 pm
Joined: Nov 2013
Posts: 3,692
Likes: 32
pooh-bah
Offline
pooh-bah
Joined: Nov 2013
Posts: 3,692
Likes: 32
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 ?
BlairW #722176 April 06th 2017 7:35 pm
Joined: Aug 2001
Posts: 12,107
Likes: 37
Maniac
Offline
Maniac
Joined: Aug 2001
Posts: 12,107
Likes: 37
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!
Page 1 of 2 1 2

Moderated by  Astro 

Link Copied to Clipboard
Donate


Upcoming Events
discovery
Who's Online Now
0 members (), 17 guests, and 11 robots.
Key: Admin, Global Mod, Mod
Newest Members
TheDrunkenGunsmith, Jac, LOVclassics, ZenMuffin, Milkman530
12724 Registered Users
Top Posters (30 Days)
SDMickey 130
CatFish 28
frscke1 28
Wedgy 20
Forum Statistics
Forums68
Topics35,747
Posts537,897
Members12,724
Most Online177
May 8th, 2013

Powered by UBB.threads™ PHP Forum Software 7.7.4