I just got my car running. It's a '39 Ford two door sedan, SBC, flat tops, double hump heads, comp cams 280h with 1.6 rockers. I'm running two AFBs. I recently found out that they are off a '66 or '67 Dodge 426 or 440 motor. Needless to say, it's really rich. A carb guy here in town suggested that I get a couple Edelbrocks specifically for a SBC. I'm going to do some research into what size and what jetting they use and begin searching. I thought I'd get your collective take on this before I did that. Thanks in advance, Rod
I ran the edelbrock set up on a 383 with two 500 cfm then set them up useing the edelbrock kit.Ran the front carb full and set the back carb up with just the two front barrel till it was at total full open.Every motor will run differnt you will have to set your own up how it wants to run.
I have a 327 with 1:94 heads and 9:1 compression and a mystery camshaft in it. I run AFB's as well. But they are off the '63 413 cross ram version. I have them hooked up progressively and they run just fine. You can tune them to be great on yours, early AFB's are great carbs. Edelbrocks aren't all they are cracked up to be, they will need to be tweaked right out of the box for your application more than likely to be optimal. So save your money on new carbs and tune the current ones to your application. You'll be alot happier in the long run. There are no specific SBC Carbs either. There are carbs made for SBC application but a Carb is a mixture device. It's as plain as that and they don't know wether they are on a Crosley or a Chevy. Figure your engine CFM requirement and tune to that. A good start is to research 2x4 factory requirements from an early Vette, probably pretty close to what you'll end up with. Anybody can bolt parts on, it takes a smart and patient man to make it run great. Take Care, Tim
Dual carbs from a Mopar in matched sets bring stupid money . Find out what you have before monkeying around with them .
what 31Vicky said....you can acquire a couple of E/brock 500s and put money in your pocket if you have a matched pair of Mopar dual quads. I have a 383 sbc with 2x E/brock 500s on an Airgap. I run it with the two front venturis at idle and easy depart, then have the progressive linkage set up to open everything else at about 3500rpm. Idles about 850 when warmed up.
Sorry to say but my twin 500 Edelbrocks run very rich on my 355 SBC. They have done this for over 5 years now and I don"'t worry about it anymore !!!! LOL
***uming the air flow capability of the carb is suited to the engine; an independantly wealthy tuner can tune a carb to the engine. That being said; the fuel requirement curve for a large Mopar and a small block Chevrolet are as different as the rear tires on a John Deere 4010 and a rear-engine dragster. There are certainly carburetors available that would require significantly less work for your application. And like mentioned by 31Vicky and propwash; correct carbs for the large Mopar engines of the mid-60's bring LARGE dollars to collectors. The size of the carbs you should use would depend on application (street, dedicated race, or somewhere in-between), and the displacement and tune of your engine. Good choices (depending on the above paragraph) might be: 400 CFM - 9400s, 9410s 500 CFM - 4758s, 4761s, 9500s, 9510s 625 CFM - 4759s, 9625s, 9635s (but not 9635sa) Jon.
Jon You left out the intake of choice as well. An intake that doesn't flow well doesn't want as much carb (CFM wise) as one that flows a ton. On the carbs themselves I think the value is a little bit dependent on if they are a matched pair off of a 2x4 or singles off of two seperate single 4 engines. If they are carbs off of two single 4 engines then it becomes a matter of if it is a standard transmission or an automatic specific carb with MOPAR kickdown linkage. OK I just through that in to muddy up the waters.
I've got two 600 cfm 1406 Edelbrocks on the 331 Ford in my 27. Bolted them on right out of the box and my plugs burn a light tan. I just got slightly over 20 mpg driving to and from Turkey Run, and that is with 4.30 gears. My Son is running the same setup on the 306 Ford in his T bucket and his isn't running rich either. If you are running progressive linkage the Edelbrocks should be fine as they are jetted a little on the mild side by design. Don
Hi guys, and thanks for all the replies. They are all helpful. ajmopar, these are two matched carbs from a 1966 Imperial. They both have idle screws. Thanks again for all the replies, Rod.
AJ - what he has are the 1966 Dodge, Plymouth, Chrysler 383 carb 4131s. Chrysler also used these as service carbs for the single carbed 426 and 440. Jon.
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