I need help i have been searching the boards and the net but can't find what i need. I have a 1969 Plymouth Satellite. It has been sitting at my friends house for almost a year due to my health it has a bb rb 440, Mopar purple 509 292 int./292 exh. with 108 degree lobe sep. cam, carter high flo fuel pump, with 8 an 1/2 in fuel line to the holly reg, Mallory hyfire 6a box,323 rear sure grip, 2500 stall, and a nitrous setup, my question is i got a dual carb intake and old offylow rise 360 style that is in great shape it had 2 650 hollys on it that are junk. but before i put it on i need to know if there is certin carbs that are made for a dual carb intake , or do you just buy 2 of the same carbs? also what cfm would be good for this setup with gas prices of the 110 oct. tht i run in it it will be mostly ran at woodburn's 1/4 mile and drivin to shows. it now has a 750 dp on it but all its seals are bad and just pours gas everywhere. would 2 650's be to much for this car note i dont care about the gas millage. you would have to be nuts to car with a car like this. or would it be better to run 2 450's or???????? and what brand of carb would be best i see a lot of dual setups now come with edelbrocks are they good for street and strip? I love this car i have had it since i was 15 im now 29 and it deserves every ounce of money i can put into it which is not much with 3 kids but i try. i have always wanted a dual carb for it or a blower and i got the intake and cars for 100 bucks so it won. any help is very much appreated as so i can get my baby back on the road ..... also would a 3000 stall tq converter be a better choice? i just remember my buddy had a 74 challenger with the same setup but single carb. with a 3000 stall and couldn't keep it at a light with out it wanting to jump out and go his last pass on it was 12.3 in a 1/4 with all the same internals as mine. im also trying to decide what shot of nitrous to run..... I have an update i dont know it it helps but my friend and i were talking and i relized i did put a 3000 stall in it a few years back.... and right now it has a eld. tourquer 2 intake on it with a 750 holly so it runs great with that but its not the look of the dual carbs under the scoop that i bought .....

Edelbrock sells carbs that are designed for duals. Look on the website and they'll give you carb recommendations. It will either be the 500 cfm carbs or two of the 600 cfm carbs. They do sell their carbs calibrated for dual quad setups so if you do some research you can get the carbs set up pretty well before you ever fire the motor.

I am not trying to beat on your combo.However I don't think a .509 cam,2500 stall,and 3.23 gears is a good setup(especially for two fours).
I don't know if the offy is a high rise tunnel ram or one of their low rise dual quad manifolds.The low rise ones are not that great from what I hear(no exp.).Either way I would be looking for small carbs such as two holley 450's or carter 500's.Vacuum secondaries would be ideal.
With that cam it may be a bear to tune right.
I would consider going with the edelbrock ch28 and two 500's.Sounds like a really cool car.

Well, my car came with a dual quad set up on a 440 High Performance. It was a dealer installed set-up that the original owners had installed before every taking delivery of the car.

It "was" two Carter AFB's in line on a single plane manifold. Basically the same intake set-up as on the 62 300 H. It operates off a progressive linkage and the front carb is the primary and has the choke and idle speed screw. I've been experimenting with tuning. The front carb went bad and I had it replaced with an Edelbrock Performer (~~600 CFM).

For the most part, both drivability and power are both pretty good. I'm still not convinced I have the carbs set up perfectly. I can tell you this, It starts and runs nice in both hot and COLD weather without any stalling or other issues. Power is pretty good, especially when the throttles are wide open and car reaches high and SCARY speeds pretty darn quickly.

Fuel economy is not too bad. I have gotten as high as 14 but usually it is about 11 or 12 mpg.
The car is a 67 Chrysler 300 'vert (pretty heavy) with torqueflite and 3.23:1 Sure Grip diff.

I agree that this does not sound like an ideal combo for a DQ set-up, but am most interested in your CR - why would you think you need to run 110 through this?

i dont think i need to it just runs better with it. if i do anything else it's 92 oct. from the local 76 station.

Don't know if you are refering to me or not Demon. My car has a 67 440 hi po that was overhauled close to stock specs by Jasper last year. Compression ratio is probably around 9.5:1 according to the info Jasper provided. I run pump unleaded premium with no ping or other issues. It did detonate on WOT before the overhaul if that means anything...it doesn't now. Far as I know, the cam is the usual Mopar BB hi po set up as included in the 375 horse 440 motors.

Actually I think the 474 Purple shaft was used in the 440 HP motors with a 10.2:1 compression (6-pak)

I do kind of agree with the previous post about the cam/converter/gearing not matched up correctly with the DQ.

My setup, as I am still building it, is a CH-28 Dual Quad with Dual 500 Eddy's. A .541 roller CompCams, 3000 B&M converter, 11:1 CR, and 3.55s with optional 3.91s if I wanna get cooky....Given this setup is in a 509 stroker, but I think you will definitely need more gear....

Since its a heavy car, maybe a CrossRam would better suit you with some AFBs?

you have poor health and 3 kids? maybe its not hotrod time.

a low velocity intake charge (2x4's) , and a low # 3.23 gear, equal disaster.

the 509 cam will need to be setup correctly. refer to a mopar performance catalog to find the combination.

wow by the sounds of it i should just stick with a single carb at this point.o and the health was poor but im back on my feet which is why im getting back into the car now.

I have run the edelbrock C-28 unit on 2 440s. It is great. I have spoke to 2 gentlemen who run the Offenhauser 2x4 intake (non T Ram) and they were happy with the performance. The Offy is an old design. Buy one new? I wouldnt- Id buy the Eddy new BUT if you already have the offy or can get it cheap by all means do it. That intake was made for AFB carb so a set of Eddy 500 or 600 cfm carbs should be considered mandatory. I ran the old 509 cam but had a 3000 stall and 4:11s. Once again, some gearhead friends have run the 509 purpleshaft (old skool cam) with the factory hi po converter and 3:23s and they said it worked fine. Dont flame me its what they claim. I have a new offy 2x4 that I will run on my 360. I know an RPM and Holley will make more power but I love the old school "Dual Quad" look.

I used to run a 383 with a tunnel ram and 2 600 vac sec holleys. The cam had .500 lift but 300 deg. of duration and I also had 3:23's in it. I think the only thing that made it driveable was the standard transmission. While you can't beat the looks of a 2-4 setup, they pretty much suck on the street. If you must do this then my suggestion would be a set of 450 cfm holleys with vac secondaries. If you go any bigger then I'd suggest you just don't hook up one of the carbs !!

I used the tunnel ram package sold in the summit magazine. It has two 450 holleys with manual secondaries on each carb. I have the same cam as you with ten to one compresion. I use 3:55 and 4:56 gears depending on if I am racing or not. Either way the set up worked real well with great street manners and good power. I often wonder if I should have chosen the bigger carbs instead. I made my own fuel line for it and the linkage you get is not so great but is functional.

I drive the CH-28 form EDL with two 600cfm from EDL
set on a pair of ported RPM heads
with a 8AN fuel line. 3.91 gears and 2800 stall.
.530 solid custom form Scott Brown.
The 275/60 tires stil spin at 45mph if I put the
pedal to the metal for only 80%.
And my car weights tons! (69 Chrysler 300).
I love this set up, but if you wanna have fun with
a 2x4 you better save some money for gas.
The price here in Germany is now over 9$ per gallon.
keep the converter, the carbs will by fine. just dial them in
correct. but you could use a cam that is more torque orientated.