Re: Factory 340 carbs
[Re: 70duster340]
#992328
05/14/11 06:20 PM
05/14/11 06:20 PM
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Joined: Feb 2003
Posts: 8,020 Pangaea
B5 Bee
master
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master
Joined: Feb 2003
Posts: 8,020
Pangaea
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2300 Holleys - 1350/970cfm Carter Thermoquad - 800cfm Carter AVS - 625cfm Carter AFB - 625cfm
Last edited by B5 Bee; 05/14/11 06:23 PM.
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Re: Factory 340 carbs
[Re: 70duster340]
#992331
05/14/11 06:48 PM
05/14/11 06:48 PM
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Joined: Jan 2003
Posts: 27,480 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,480
So Cal
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Quote:
So, was the thermoquad on the later model 340's? What year for each version of carb, if that is possible? Also, what cfm rating was used?
Thanks for all the replies!!!
68-70 AVS - 625 cfm 70 340-6 2300 Holleys - 1350/970cfm 71-73 Thermoquad - 800 cfm
No AFB's on 340's.
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Re: Factory 340 carbs
[Re: autoxcuda]
#992333
05/14/11 06:58 PM
05/14/11 06:58 PM
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Joined: Feb 2003
Posts: 8,020 Pangaea
B5 Bee
master
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master
Joined: Feb 2003
Posts: 8,020
Pangaea
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Quote:
Quote:
So, was the thermoquad on the later model 340's? What year for each version of carb, if that is possible? Also, what cfm rating was used?
Thanks for all the replies!!!
68-70 AVS - 625 cfm 70 340-6 2300 Holleys - 1350/970cfm 71-73 Thermoquad - 800 cfm
No AFB's on 340's.
Sure there was, just not automotive. That's an AFB under the flame arrestor on this '73 340.
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Re: Factory 340 carbs
[Re: B5 Bee]
#992334
05/14/11 07:07 PM
05/14/11 07:07 PM
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Joined: Jan 2003
Posts: 27,480 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,480
So Cal
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Quote:
Quote:
Quote:
So, was the thermoquad on the later model 340's? What year for each version of carb, if that is possible? Also, what cfm rating was used?
Thanks for all the replies!!!
68-70 AVS - 625 cfm 70 340-6 2300 Holleys - 1350/970cfm 71-73 Thermoquad - 800 cfm
No AFB's on 340's.
Sure there was, just not automotive. That's an AFB under the flame arrestor on this '73 340.
..
We was looking for a automotive application. But industrial, boat, etc have all kinds of different stuff.
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Re: Factory 340 carbs
[Re: 70duster340]
#992336
05/14/11 07:20 PM
05/14/11 07:20 PM
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Joined: Jan 2003
Posts: 826 Stone Mt, GA.
DEMONSIZZLER
super gas
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super gas
Joined: Jan 2003
Posts: 826
Stone Mt, GA.
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The ThermoQuad was introduced in '71 for the 1st time as on oem carb with 800 cfm's. It had existed since '69 as an after-market performance carb avail in either 850 cfm's or 1,000 cfms and is know as the Competition Series.
The primaries on the '71-'73 340 T.Q.'s was approx 232 cfm's and a whopping 570 cfm's on the 2ndary side. The double booster design of the primaries gives the T.Q. an excellent port floor signal and exceptional fuel/air atomization. And the sophisticated metering system is very precise. And the carb was very 'change-able' to increasing EPA demands for cleaner running engines so it was easy to add smogger settings and parts that made the carb pass increasing emissions requirements.
The '71 340 T.Q. was a one year only design, derived from the 69 Competition Series carb. The carb is an air metered carb while all '72-up ThermoQuads are solid fuel metered.
CS series 850.......4846S for press in jets, ....................4846SA for screw in jets, CS series 1,000.....4847S for press in jets, ....................4847SA for screw in jets, '71 340 800.........4972 for 4 spd, ....................4973 for automatic, '72 340 800.........6138 for 4 spd, ....................6139 for auto, '73 340 800.........6318 for 4 spd, ....................6319 for auto.
These '72 carbs(oem)will suffer in performance if the correct casting # top is not used. The best 340 T.Q. is the '72 as it had the best metering system and it will make very close to the same power as the early '72-'73 big block 850 cfm carbs.
Over-all, these carbs are hard to beat in both gas mileage and performance!
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Re: Factory 340 carbs
[Re: B5 Bee]
#992337
05/14/11 07:26 PM
05/14/11 07:26 PM
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Joined: Jan 2003
Posts: 27,480 So Cal
autoxcuda
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,480
So Cal
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Quote:
Well, the question was ALL the carbs that came on factory 340s.
That's true.
But without saying what the AFB's were on, some people reading it will think they came on 68-73 automotive applications and it will just confuse them.
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Re: Factory 340 carbs
[Re: 70duster340]
#992340
05/15/11 11:31 PM
05/15/11 11:31 PM
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Joined: Jan 2003
Posts: 42,714 Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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Quote:
Don't mean to seem ignorant, but what is the difference between the AFB and the AVS?
Well assuming you are trying identify one or the other and not every single detail of what set's them appart?
These are AFB's (Aluminum Four Barrel)
There were two basic designs on Mopars, early and late. These are the early styles (with vestigial choke tube in the lid) found on early to mid 60's Mopars.
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