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1972 340 w/400-450 HP what is a good carb setup. #2512738
06/24/18 08:49 PM
06/24/18 08:49 PM
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Bradford, Ontario
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Barrelhouse Offline OP
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My 340 was completly rebuilt using good quality parts. My engine builder says is will be producing 400 to 450 HP. Ive been bouncing different carb setups and wanted to ask what would be a excellent setup to run on a car that will be drivin on the street daily during the warm months. Im not a engine expert by any means so im here to find out what you guys think i want it to be a well balanced running engine i know too much carb or too little can choke performance what do you Moparts members think would be good. I have a OE Holley 70 340 4-spd six pack setup and OE intake manifold off a 70 TA Challenger would that be enough CFM for my engine ?.

Last edited by Barrelhouse; 06/24/18 08:51 PM.
Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: Barrelhouse] #2512758
06/24/18 09:33 PM
06/24/18 09:33 PM
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justinp61 Offline
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My 340 was in the 450 hp range and it ran good with a 750 dp.

Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: Barrelhouse] #2512797
06/24/18 11:05 PM
06/24/18 11:05 PM
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Barrelhouse Offline OP
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Thanks thats good to know. What make of carb was it ?.

Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: Barrelhouse] #2512906
06/25/18 08:49 AM
06/25/18 08:49 AM
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fastmark Offline
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I have an AAR with the factory six pack. I’m a good tuner and it runs good and looks good. The best running 340 car I ever drove was a TA four speed with 700 DP Holley. But if I had my choices, nowadays you run fuel injection.

Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: Barrelhouse] #2512921
06/25/18 10:08 AM
06/25/18 10:08 AM
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steve70 Offline
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A 1972 Thermoquad would be perfect for your set up. My engine builder was amazed at how well it worked on my engine. Talk to Scott Smith at Harms Automotive- http://www.harmsauto.com/


1970 Challenger T/A 4 speed
1971 Charger R/T 4 speed-Mr Norms
1971 Duster 340 4 speed-2017 MCACN Gold Winner
Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: fastmark] #2512927
06/25/18 10:25 AM
06/25/18 10:25 AM
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Mr T2U Offline
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Originally Posted By fastmark
nowadays you run fuel injection.



i AGREE.
look into some of the self learning throttle body stuff.
by the time you buy everything for the car fuel injection won't be that much more than a carb setup. and it will run, start and respond much better than a carb and you won't have to rejet and tune all of the time. a large factory air cleaner can hide everything and no one will know you are fuel injected unless you tell them.


perception is 90% of reality
Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: Barrelhouse] #2512935
06/25/18 10:47 AM
06/25/18 10:47 AM
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The double pumper carbs are good carbs and would be a good recommendation if the car would spend it's time at the track. Because it is a track oriented carb. But that makes it way too rich in the transitions for the typical street applications.

All carb manufacturers make carbs that are track oriented and carbs that are street oriented. They do that because there is a difference in when and how much fuel needs to be delivered between the street and the track.

Here are a couple of articles regarding the Street Demon carb. And there are plenty of others out there if you want to do a search. I have installed Street Demons on several different cars and believe that they are the best carbs for mild street cars whose owners want a plug and play carb with good street manners.

http://www.carsillustrated.com/tech-got-me-one-of-those-double-pumpers-street-demon-carburetor/

https://www.youtube.com/watch?v=jN2xbt6Mzdc

https://www.youtube.com/watch?v=DPOuEOkazVc


KOS
Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: Mr T2U] #2512940
06/25/18 11:20 AM
06/25/18 11:20 AM
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Originally Posted By Mr T2U
Originally Posted By fastmark
nowadays you run fuel injection.



i AGREE.
look into some of the self learning throttle body stuff.
by the time you buy everything for the car fuel injection won't be that much more than a carb setup. and it will run, start and respond much better than a carb and you won't have to rejet and tune all of the time.


tsk That is simply NOT true!

New Street Demons and throttle brackets are all over Ebag, Amazon, etc for $350-$400, all in. I usually buy refurbished, which are even less.

Show us the complete EFI systems that aren't that much more. And the customer reviews that go with them. You also forgot to mention the much more involved installation process for EFI and it's learning curve.


KOS
Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: Barrelhouse] #2512951
06/25/18 11:45 AM
06/25/18 11:45 AM
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Spokane Washington
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I'm obviously a carb guy and will agree that in many ways fuel injection is a more efficient system. However, with a vintage car those selling/promoting fuel injection are (in general) exaggerating the simplicity and cost associated with buying and installing them.

Carb choices? as mentioned, a 750cfm carb would be a good choice for your estimated power level. Holley, Demon, or stock, performance will be similar within a few HP. Personally I think a 72 TQ would be a great choice, I've done dozens of them for past customers with similar engines and have never heard anything negative. If stock isnt your bag I'd go with one of the new Street Demon carbs (they look a lot like a TQ). Great new design and simple to tune.

.02

Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: Barrelhouse] #2512974
06/25/18 12:37 PM
06/25/18 12:37 PM
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Best street manners I've ever experienced in that power range was a Thermoquad properly done. Crisp response, good MPG, lacked nothing for power in that application/power level.
It's easy to be seduced by big CFM, but most of the time a street engine's at low RPM or in transition. The small-primary/large secondary T-Quad is really good at that when done right.

Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: topside] #2512985
06/25/18 12:59 PM
06/25/18 12:59 PM
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i'm a T-Quad guy myself. it took me a looong time to figure them out back in the day when they were new [way before the interwebs], but when i finally figured them out, they proved to be the best of both worlds. good street manors, and worked well at the track to boot ! just my opinion, your mileage may vary.
beer

Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: Barrelhouse] #2513006
06/25/18 01:35 PM
06/25/18 01:35 PM
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Oregon
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Really depends on you mostly. If you don't own a carb and don't know a lot about carbs then get a simple street carb like a 600 cfm Edelbrock.

Personally I'd put a Holley Sniper on there but it is about a $1500 investment by the time you consider the new fuel tank and internal pump. In the long run you'll enjoy the Sniper and you'll wonder why you ever considered a carb but you have to get over the learning curve.

Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: steve70] #2513014
06/25/18 01:48 PM
06/25/18 01:48 PM
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Mesa, Arizona
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Originally Posted By steve70
A 1972 Thermoquad would be perfect for your set up. My engine builder was amazed at how well it worked on my engine. Talk to Scott Smith at Harms Automotive- http://www.harmsauto.com/



iagree

I was amazed on how my stroker performed with a T quad.

Last edited by dart4forte; 06/25/18 01:48 PM.
Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: dart4forte] #2513031
06/25/18 02:23 PM
06/25/18 02:23 PM
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I run a Demon 850 cfm in my Duster, but my horsepower level is higher
than your application. That said, I would use a Thermoquad, on your 340.
Get a hold of Scott, as others have mentioned, he can set you up with a nicely restored Thermoquad that will perform well. twocents
BTW...what combo did you use in your 340 build? IE: cam/compression/pistons/intake/headers/manifolds,etc?? Just curious!

Last edited by RoadRunnerLuva; 06/25/18 02:59 PM.

"Get busy living or get busy dying"....

1972 Plymouth Duster...418ci Stroker Small Block
1973 Dodge Charger SE Brougham...400 Magnum Big Block (SOLD)
1971 Plymouth Duster...360 4bbl (SOLD)
1970 Dodge Challenger...340 4bbl (SOLD)
1969 Dodge Dart...440 Big Block (SOLD) Burn't up in a fire
1969 Chrysler 300 Convertible...440 Big Block (SOLD)
1968 Dodge Dart Custom...318 4bbl (SOLD) Smashed/wrecked
1998 Dodge Dakota R/T 5.9 Magnum
2002 Jeep Grand Cherokee 4.0
Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: Barrelhouse] #2513095
06/25/18 05:00 PM
06/25/18 05:00 PM
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What cam is in it?

At 400 to 450 hp with a 340 I’m thinking it’s fairly aggressive. Probably not a lot of vacuum. But would have to see cam specs.

I’m thinking you might need something with adjustable throttle blades and four corner idling is just a street hippo stall converter

Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: Barrelhouse] #2513125
06/25/18 05:54 PM
06/25/18 05:54 PM
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One thing never mentioned is the howl a TQ makes when all four butterflies open up.

It'll turn heads

From the inside

https://www.youtube.com/watch?v=NeVPX3MMGGs



They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: Barrelhouse] #2513175
06/25/18 07:40 PM
06/25/18 07:40 PM
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Bradford, Ontario
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Barrelhouse Offline OP
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I just talked to Scott at Harm's i have a OE 70 TA Challenger 4-spd six pack setup and OE intake manifold im going to use. Im shipping Scott my carbs for a OE restoration. He said they will work great for a daily fair weather driver as i want to drive it alot good guy to talk to he knows his craft well and i dont mind paying big $$$$ for restored carbs from Harm's. Thanks to all that chimed in i love this site and the members on it Mopar guys really do help each other out .

Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: Barrelhouse] #2513192
06/25/18 08:15 PM
06/25/18 08:15 PM
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Back in the 70's I had a '69 340 swinger that ran 12.8's with a Holley 800 spread bore DP, factory iron intake with spread bore adapter, 3,500 B&M convertor, headers, JC Whitney 500 lift/ 300 duration cam and 5.13 gears. The pic is the Swinger at Hawaii Raceway park (now closed).

106_2834.JPG

I love the smell of Deer guts in the morning, it smells like... VICTORY!
Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: DaveRS23] #2513203
06/25/18 08:34 PM
06/25/18 08:34 PM
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Mr T2U Offline
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Originally Posted By DaveRS23
Originally Posted By Mr T2U
Originally Posted By fastmark
nowadays you run fuel injection.



i AGREE.
look into some of the self learning throttle body stuff.
by the time you buy everything for the car fuel injection won't be that much more than a carb setup. and it will run, start and respond much better than a carb and you won't have to rejet and tune all of the time.


tsk That is simply NOT true!

New Street Demons and throttle brackets are all over Ebag, Amazon, etc for $350-$400, all in. I usually buy refurbished, which are even less.

Show us the complete EFI systems that aren't that much more. And the customer reviews that go with them. You also forgot to mention the much more involved installation process for EFI and it's learning curve.



maybe a little more. i would figure about $1K for a COMPLETE FITECH system with external walbro fuel pump and lines.
from what i have read they are pretty good overall system with a not so complicated setup.
once installed with the basic parameters programed in. then a couple trips around the block it's ready to go. it's self learning so the more you drive it the better it runs.

now with a carb the initial buy in is just part of the price. the weather changes you have to re jet and adjust, the weather changes you have to adjust again. with the alcohol mixed fuel it will eat the seals, accelerator pumps, and floats. now you gets leaks. really hot day you get vapor lock. sit for a while when hot and the fuel boils in the carb. sit for weeks at a time you have no fuel in the car and have to crank and crank until it starts.
i know i am exaggerating a bit on the problems, but they do happen a lot. jets, gaskets, air bleeds all cost $$. it adds up. when i had my hemi with a carb i was adjusting it almost every other day. the temp changes 15* and adjust again. runs great in the morning runs a little rough in mid day runs like crap in the evening. or maybe runs great in the AM and PM runs like crap in the daytime.
self learning FI almost none of the listed problems happen. hop in and drive. even when it's running a bit off, it is probably running better than a carb could hope to.
i know it's not a FITECH system. but my 08 supercharged mustang the only thing i have to do is fill it up and drive. change the plugs 1 time a year and change the oil every 2K miles. car makes 650rwhp on pump 93, runs 10's all day long at the track if i don't miss a shift, drive it to the track, drive it home and gets 25mpg. never had ANY of the above listed carb problems.
the only thing i do to it is load my race tune at the track, 5* timing and richen it up a little bit with my hand held tuner don't even have to open the hood to do it.

Last edited by Mr T2U; 06/25/18 08:42 PM.

perception is 90% of reality
Re: 1972 340 w/400-450 HP what is a good carb setup. [Re: Mr T2U] #2513227
06/25/18 09:25 PM
06/25/18 09:25 PM
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Originally Posted By Mr T2U


maybe a little more. i would figure about $1K for a COMPLETE FITECH system with external walbro fuel pump and lines.
from what i have read they are pretty good overall system with a not so complicated setup.


From what I read

Famous last words.

You try running an EFI setup with just an external pump and a stock tank you will suck air regularly.

Your carb "issues" are grotesquely overblown as well.

Hyperbole, look it up


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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