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| | | Carb recommendation ? | Joined: Jul 2016 Posts: 96 journeyman | OP 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 ? | Joined: Sep 2005 Posts: 9,855 Likes: 234 carpal tunnel | carpal tunnel Joined: Sep 2005 Posts: 9,855 Likes: 234 | 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 ? | Joined: Jul 2016 Posts: 96 journeyman | OP journeyman Joined: Jul 2016 Posts: 96 | No one runs a carburated van here?
1979 Nomad 2005 E350 Cutaway Class C
| | | Re: Carb recommendation ? | Joined: Aug 2001 Posts: 12,107 Likes: 37 Maniac | 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 ? | Joined: Apr 2013 Posts: 104 member | 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.
| | | Re: Carb recommendation ? | Joined: Nov 2013 Posts: 3,692 Likes: 32 pooh-bah | 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 | | | Re: Carb recommendation ? | Joined: Jul 2016 Posts: 96 journeyman | OP 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 ? | Joined: Nov 2013 Posts: 3,692 Likes: 32 pooh-bah | 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 ? | Joined: Aug 2001 Posts: 12,107 Likes: 37 Maniac | 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.
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