1972 Plymouth 340 - 4 speed - 355 gear - Carburetor Suggestions

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scavonesp

I Love Dusters
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Looking for advice! I have a 1972 Plymouth Duster 340 - 4 speed with a stock manifold, stock exhaust manifolds, stock fuel pump, 355 gear, mild cam (don't have cam specs). I run the streets only, I am looking to put the TQ on the shelf and try out an Edelbrock carb. Any suggestions for model and size for my setup would be greatly appreciated. Thank you!

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I'd say an Edelbrock 600 with an electric choke would work great. Your car is a 4 speed, so I'm not sure if you'd need the Edelbrock throttle linkage adapter for Chrysler vehicles or not? I have that same carb on my 71 Challenger conv with a 360 and an LD340 intake, and it works awesome. All that being said...back in the day I had a 73 Challenger 340, and took the TQ off of it because I could never get it adjusted right. I put a Holley 650 spreadbore on it, and it ran like a gut shot cat! Good luck with it. :)

:thumbsup:
 
JDMopar said:
I'd say an Edelbrock 600 with an electric choke would work great. Your car is a 4 speed, so I'm not sure if you'd need the Edelbrock throttle linkage adapter for Chrysler vehicles or not? I have that same carb on my 71 Challenger conv with a 360 and an LD340 intake, and it works awesome. All that being said...back in the day I had a 73 Challenger 340, and took the TQ off of it because I could never get it adjusted right. I put a Holley 650 spreadbore on it, and it ran like a gut shot cat! Good luck with it. :)

:thumbsup:
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Thank you for the quick response!
 
word on the street says the avs2 is as close to fuel injection in a carb your going to get
 
Gave up on my TQ, pulled the Edelbrock that was on it when I got the car and swapped a Carter AFB Competition that was on my other Duster and I feel like I have a different car. Basic same set up as yours but this AFB totally changes this car, and hardly no adjustments!
 
Best aftermarket carb for your combo is the Edel AVS2. It has small primaries with annular boosters that give great throttle response.
You already have the best carb on it: the TQ. If you don't know how to re-build/tune it, find somebody who knows.
I believe Woodruff Carbs specialises in them, somebody on here probably has his details.
 
Having run most of these combos mentions over the years I would keep the TQ. It’s a great carb when built correctly. The spread bore holley is a bolt on so that’s a nice alternative. The AVS and AFB choices require an intake change or spacer. Maybe a creative gasket stack up will work too but I have never done that.

My best running stock 340 was my old 73 340/727 Dart Sport with 3.55’s in the 8 1/4. Had the stock TQ and it delivered great drivability, decent fuel mileage and performance.

Cliff Ramsdell
 
I agree about the TQ. I have a 68 340/4 spd/323 gear. I'm running a used 750 Eddy that came off a 440 I bought from a member here. Didn't change a thing on it and it runs great. I believe the TQ is 800 cfm ?
 
scavonesp said:
Looking for advice! I have a 1972 Plymouth Duster 340 - 4 speed with a stock manifold, stock exhaust manifolds, stock fuel pump, 355 gear, mild cam (don't have cam specs). I run the streets only, I am looking to put the TQ on the shelf and try out an Edelbrock carb. Any suggestions for model and size for my setup would be greatly appreciated. Thank you!

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Beautiful car! The Edelbrock AVS2/650 will give you excellent throttle response and good mileage. You will need the Chrysler throttle extension kit to maintain the throttle cable alignment. Like you, I am running the stock cast iron intake (and exhaust) and needed a carb heat shield because of how close the AVS2 is to the intake. Unlike a TQ, the Edelbrock/Holley's are aluminum so they conduct heat right into the fuel! The AVS2 carb comes with a 3/8" fuel inlet nipple, so if you are currently running 5/16", you will need to modify that. I also got the Edelbrock tuning kit so I could tune my carb to my engine. Not a lot of money but allows you to get things perfect. I agree with others that the TQ is excellent once built/tuned properly. I ran TQ's for years back in the 80's. The only reason I don't run one now is it is difficult to get a strip kit so you can tune the jets/rods. The AVS2 with its redesigned annular booster has excellent off the line response and won't let you down.
 
That is one good looking Duster! Would love to see pics of it inside and out!
 
Cliff Ramsdell said:
The AVS and AFB choices require an intake change or spacer. Maybe a creative gasket stack up will work too but I have never done that.
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When I swapped on a old Federal-Mougal Competition carb it bolted right on without any issues including the egr on the intake. A thick fiber gasket is advised to combat heat and boiling the fuel in the bowl. It’s really weird to here fuel percolate like a coffee pot.

Kendog 170 said:
I believe the TQ is 800 cfm ?
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There are two sizes to the OE TQ which are given a moniker or big and small due the primary sizes or ether 1.38 or 1.5. Typically given the cfm ratings of 800 & 850.
There actual flow rate is less. We did have a fella here (God rest his sole) that claimed he had the actual ratings which fell in the 737 or 787 ish, IIRC area. Then there are the 3 other TQ’s. The small over the counter QJ replacement with both Chrysler and GM throttle arms and electric chokes and two race versions at what is claimed as true 800 & 1,000 cfm. Both of these came with 2 part numbers each. They meter the air & fuel like the first year TQ.

IMO, there are 4 carbs I’d call entry level and good replacements.
Edelbrock’s AVS II carb
Holley’s 4010/4011 series carb
Holley’s Demon TQ like carb
Then there is the standard Holley 4160/4150 which is perfectly fine as well as there a well established carb.

MoPar guys are most familiar with what came on top, the Carter carbs which make a recommendation of the Edelbrock carbs very easy to do. There rock steady reliable. Jet, set it, forget it, your good to go. A once in a while cleaning of the air passages on top of the boosters is all that is needed.
 
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I've got the same combo in my E-body and put a 650 AVS2 with electric choke on to replace the rebuilt Holley 650 DP. Night and day difference. Runs great with very little adjustment. Probably not perfect but for cruising it is more than sufficient. The Street Demon would probably work just as well. For the price, it wasn't worth the time messing with getting the worn Holley to run right, and it maybe never would due to shaft wear and other issues.
 
Years ago I had a 72 340 duster, auto, 3.55 gears, big valve J heads, early 340 pistons, MP 274 cam (IIRC), stock intake and exhaust manifolds. I ran a 650 DP on it and was very pleased with it.

BTW, beautiful Duster! :thumbsup:
 
i like the holley street demon , i'm using the 850 and it works well better gas mileage than the old holey 750 i had on itbefore , starts easy
 
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