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  #1  
Old 04-27-2005, 12:25 PM
demons72 demons72 is offline
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Default demon 72 ,71 340 carb

Does anyone know what type (name) of 4 barrel carburator came stock with a 1971 demon 340 engine? I have a hood scoop, with two holes on the bottom . The j heads, were they stock for the 71 engine? The car is late nov. 1971 but considered a 72.
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Old 04-27-2005, 01:14 PM
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dwc43 dwc43 is offline
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J heads with 2.02 valves are stock. The stock carb is a Carter Thermoquad rated at 800 cfm. You can still get them from Advance auto for one. Holley builds them with all noew parts now. The hood scoops were never hooked up to anything.
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Old 04-27-2005, 02:31 PM
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Fast_Eddie Fast_Eddie is offline
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DW's correct, the two holes were never hooked up to anything. These indicate your car had the twin scoops hood and not the dual snorkel, single sccop hood.

Strange really because most "late" 71's had the latter style hood.
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Old 04-27-2005, 03:04 PM
demons72 demons72 is offline
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my mistake, it does have a dual snorkel(connected) Are the holes then for show or ventilation? So no weird hook up for the snorkel to the carb?
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Old 04-27-2005, 03:33 PM
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THey add a little fresh air under the hood, but there is nothing to connect to the air cleaner.
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Old 04-27-2005, 04:06 PM
DEMON SIZZLER DEMON SIZZLER is offline
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Quote:
Originally Posted by demons72
Does anyone know what type (name) of 4 barrel carburator came stock with a 1971 demon 340 engine? I have a hood scoop, with two holes on the bottom . The j heads, were they stock for the 71 engine? The car is late nov. 1971 but considered a 72.

You will not find the '71 340 one year only air metered T.Q. carb at an auto parts store. These are scarce carbs and were often replaced with a '72 340 solid fuel metered T.Q. carb. The '71 340 Demon used the twin Super Bee/Coronet R/T hood scoops while the '72 340 Demon used the optional twin snorkle single hood scoop. The '72 340 scoop option hood had two holes closer togther than the '71 twin scoop hood. Also the build date you indicated
is a '72 model that used the 'J' or 915 1.88" intake valve heads while the '71 340 'J' head used a 2.02" intake valve. If you try to order a rebuilt T.Q. carb from an auto parts store, it is likely that you will get a poor performing smogger carb!
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Thermoquads made to perform!
Stock, street/strip and 1,000 cfm race carbs; also new parts for
Competition Series, 1971, 72-84
and SuperQuads at:
www.thermoquads.com
e-mail: demonsizzler1@cswebmail.com
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Old 04-27-2005, 07:42 PM
demons72 demons72 is offline
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My car has the twin snorkle single hood scoop. It has the 72 body style although it was made in nov of 1971. The holes are close together in the hood. so the carter 4 bbl carb was the original? and no other hook up for the twin snorkle?
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  #8  
Old 04-27-2005, 08:42 PM
demons72 demons72 is offline
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Here is the picture of my 1972 demon, Paid $50 canadian dollars when I was sixteen. Its being restored back in Manitoba.
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File Type: jpg office 339.jpg (5.4 KB, 29 views)
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  #9  
Old 04-27-2005, 08:45 PM
gthomas gthomas is offline
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1972 340 w/manual trans = 6138S
1972 340 w/auto trans = 6139S
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Old 04-27-2005, 10:19 PM
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Quote:
Originally Posted by demons72
My car has the twin snorkle single hood scoop. It has the 72 body style although it was made in nov of 1971. The holes are close together in the hood. so the carter 4 bbl carb was the original? and no other hook up for the twin snorkle?

Sept. '71 build dates up to 12 '71 are considered '72's and they are titled as such. Your car has the correct scoop and hood. And the Carter Thermoquad is the original carb for your 340. From '71 and up the Thermoquad is stock on all 340 and 360 engines and when the 318 went to a 4bbl engine it got the same Thermoquad as well.
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  #11  
Old 04-28-2005, 08:37 AM
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Quote:
Originally Posted by DEMON SIZZLER
The '71 340 Demon used the twin Super Bee/Coronet R/T hood scoops while the '72 340 Demon used the optional twin snorkle single hood scoop. The '72 340 scoop option hood had two holes closer togther than the '71 twin scoop hood.
As said before, late build '71 models used the '72 style hood/scoop.
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  #12  
Old 04-28-2005, 10:54 AM
DEMON SIZZLER DEMON SIZZLER is offline
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Just through the '74 model year, there was a total of 16 different models used
and about double that figure from '75 through '85(this includes the SuperQuad replacement 800 cfm carbs)models. The carbs changed physically and internally year by year. It is crucial to get the correct carb for your application no matter what brand it is!
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Thermoquads made to perform!
Stock, street/strip and 1,000 cfm race carbs; also new parts for
Competition Series, 1971, 72-84
and SuperQuads at:
www.thermoquads.com
e-mail: demonsizzler1@cswebmail.com
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