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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Joined: Jul 2015
Posts: 180 Bradford, Ontario
Barrelhouse
OP
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OP
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Joined: Jul 2015
Posts: 180
Bradford, Ontario
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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.
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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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Joined: Dec 2011
Posts: 892 MA
steve70
super stock
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super stock
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MA
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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
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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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Joined: Apr 2005
Posts: 4,923 new berlin wisconsin
Mr T2U
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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
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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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Joined: Jan 2003
Posts: 12,160 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,160
Benton, IL.
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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=jN2xbt6Mzdchttps://www.youtube.com/watch?v=DPOuEOkazVc
Master, again and still
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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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Joined: Jan 2003
Posts: 12,160 Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,160
Benton, IL.
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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. 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.
Master, again and still
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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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Joined: Feb 2003
Posts: 16,150 Mesa, Arizona
dart4forte
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I Live Here
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Mesa, Arizona
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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/ I was amazed on how my stroker performed with a T quad.
Last edited by dart4forte; 06/25/18 01:48 PM.
“So if it’s on the internet it must be true”
Abe Lincoln
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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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Joined: Jan 2003
Posts: 5,328 Land 'O Lakes
RoadRunnerLuva
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Land 'O Lakes
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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. 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.
Plymouth Makes It!
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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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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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About to go away
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up yours
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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.
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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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Joined: Aug 2006
Posts: 2,523 God's Country Maryland
GODSCOUNTRY340
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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).
I love the smell of Deer guts in the morning, it smells like... VICTORY!
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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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Joined: Apr 2005
Posts: 4,923 new berlin wisconsin
Mr T2U
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new berlin wisconsin
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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. 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
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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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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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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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