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Re: 340 vs 360 4bbl intake
[Re: 340SHORTY]
#149128
11/11/08 03:14 AM
11/11/08 03:14 AM
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Joined: Jun 2006
Posts: 5,163
CT
GTX MATT
master
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master
Joined: Jun 2006
Posts: 5,163
CT
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Yeah youre going to loose some throttle response with a 340 intake. Youre probably best off picking up an Edelbrock Performer 318/360, its designed for 318 ports, plus it will save some weight.
Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
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Re: 340 vs 360 4bbl intake
[Re: 69L78Nova]
#149130
11/11/08 12:26 PM
11/11/08 12:26 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
The only people that call them that, are people with no brains that dont know how to work on them.
..or have had the plastic bodies warp on them rendering them useless and pissing gass all over a hot intake creating an inferno under the hood. 
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Re: 340 vs 360 4bbl intake
#149132
11/11/08 01:04 PM
11/11/08 01:04 PM
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Joined: Jan 2003
Posts: 683
CENTRAL MINN
1965_PLYMOUTH
mopar
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mopar
Joined: Jan 2003
Posts: 683
CENTRAL MINN
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Quote:
Quote:
The only people that call them that, are people with no brains that dont know how to work on them.
..or have had the plastic bodies warp on them rendering them useless and pissing gass all over a hot intake creating an inferno under the hood.
 I too, have seen too many leaking ones to be a lover of them. I do notice though that the small block ones do seem to hold up much better. the heat coming off the big block engine was too much for this carb. 
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Re: 340 vs 360 4bbl intake
[Re: 69L78Nova]
#149135
11/11/08 01:27 PM
11/11/08 01:27 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Hi Scott. I would get a square bore 318 one for the ports to match. With the lack of cubes you wouldn't want to have any mismatch of parts that would hurt you if you can help it.
live every 24 hour block of time like it's your last day on earth
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Re: 340 vs 360 4bbl intake
[Re: 69L78Nova]
#149136
11/11/08 01:41 PM
11/11/08 01:41 PM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Well these things were warping and cracking within a very short time of being new so it didn't take 30+ years of deteriorating to do the damage and warp and crack the bowls. There were more bad ones come in than good for repairs/replacement.  If you were lucky and goe a good one they were great but-------------- PS: I am not a lover of Holley double pumpers on the street either. But over the last 40+ years have had a lot less problems with Holley carbs than Thermoquads.  If you like them fine use them. If you find a good one.
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Re: 340 vs 360 4bbl intake
[Re: RapidRobert]
#149137
11/11/08 02:35 PM
11/11/08 02:35 PM
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Joined: Aug 2008
Posts: 1,568
Omaha, Nebraska
Scott Carl
OP
pro stock
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OP
pro stock
Joined: Aug 2008
Posts: 1,568
Omaha, Nebraska
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Quote:
Hi Scott. I would get a square bore 318 one for the ports to match. With the lack of cubes you wouldn't want to have any mismatch of parts that would hurt you if you can help it.
Thanks Robert. Is the mismatch what would cause the loss of throttle response with a 340 intake that GTX Matt spoke of? Could any of that be salvaged by grinding the ports to match the manifold?
Thanks
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Re: 340 vs 360 4bbl intake
[Re: RapidRobert]
#149139
11/11/08 03:09 PM
11/11/08 03:09 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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I've run a 750cfm 3310 vacuum secondary Holley on a number of different cars/engines/setups that are driver type vehicles. The only time a power valve ever blew was when the car wasn't tuned right right after a rebuild. Oh yeah, at least I can get parts for said Holley when/if I need them....  ...but I usually don't. Where, again, can you find a new main body for a Thermobogger?  While your fixin' I'll be 
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Re: 340 vs 360 4bbl intake
#149140
11/11/08 03:42 PM
11/11/08 03:42 PM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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Quote:
I've run a 750cfm 3310 vacuum secondary Holley on a number of different cars/engines/setups that are driver type vehicles.
The only time a power valve ever blew was when the car wasn't tuned right right after a rebuild.
Oh yeah, at least I can get parts for said Holley when/if I need them.... ...but I usually don't.
Where, again, can you find a new main body for a Thermobogger?
While your fixin' I'll be
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Re: 340 vs 360 4bbl intake
[Re: 69L78Nova]
#149143
11/11/08 06:39 PM
11/11/08 06:39 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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The factory 318 4 barrels used the 360 intake manifold. I wouldn't hesitate to use the factory iron manifold on a 318. The factory 340-360 manifolds were a great design, many aftermarket manifolds show a power loss in comparison.
Sheldon
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Re: 340 vs 360 4bbl intake
[Re: Scott Carl]
#149144
11/11/08 07:22 PM
11/11/08 07:22 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 best factory LA 4bbl intake for the spread-bore T.Q. carbs was the '71 and '72 340 intakes while the best factory square bore LA intakes was the '68-'70 340 intakes.
ThermoQuad carbs have the following strong points:
1)weigh 40% less than a typical Holley 4bbl modular design,
2)keep the fuel about 25+ degrees cooler in summer heat which translates to more power(phenoilc bowl)
3)are the newest American 4 bbl designed carb and has the most sophisticated metering system of all .(The basic Holley 'modular' design goes back to about 1955 and the Carter AVS about 1965, the Q-Jet about 1964, the Carter AFB about 1957 while the solid fuel metered T.Q. was designed in approx 1971.
3)Thermoquad carbs can be tuned externally on all three main circuits and therefore do not require re-jetting on the '72-'74 oem carbs.
4)offer excellent gas mileage,
5)offer excellent performance too.
6)have gained in popularity a great deal; many models are now bringing up to $300+ just for a build-able core.
It is true that bowls can warp but it is not as common as you might think. And repair can be done successfully to remedy warp age.
I strictly use T.Q. carbs on all of my own cars and have quite a few satisfied customers using T.Q. carbs, David.
ThermoQuads:stock, street/strip and race;
800/850 cfm's, 860/910 cfm's and 1,000 to 1,060 cfm's.
New parts for all OEM 1971-1984, Competition Series and SuperQuad carbs and custom fabricating.
Carbs bought and sold. Consulting on pre-purchases
so you get the right carb the first time.
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Re: 340 vs 360 4bbl intake
#149145
11/11/08 07:23 PM
11/11/08 07:23 PM
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Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,419
Kalispell Mt.
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You say you don't call names but you were the first one to call the TQ a name, I give you credit though cuz you deleted it. TQ main bodies are still available new BTW. A TQ would be the best choice, just get one from someone who knows what they are doing. I just got a 72 340 carb given to me by a guy who hates TQs swore it would never run again, it was fresh from tomco. I pulled the top off and found no orings in the bottem of the jet wells and the tab that engages the secondaries was bent to open the secondaries all the way. I bent the tab back threw in some o-rings and it runs great, no choke hooked up and it starts right up and idles cold even at 30 degrees F and I can hit the gas and go. Most every TQ someone has told me was junk was a user error. The only broken bowl I have seen that wasn't from throwing around was where he was trying to pry the top off with two screws still holding inside the choke tower. I guess that warped bowl was the TQs fault. BTW there is a comment in one of the mopar mags a while back about this happening and I was rollin laughin because I knew someone who had done it. Now back to the subject. The port mismatch is not as bad on the 360 manifolds as the 340 manifolds but there are no factory square bore 360 manifolds. The 360 4bbl manifold actually matches the 318 heads better than the 360 heads. Also yes the 318 4bbls used the same manifold as the 360 but they also had a 360 head. That all being said I would just get a 340 manifold and plop it on if you run a square bore and not worry about the mismatch unless I already had the heads off. I have ran them like that and they seem to be fine as long as the carb ain't too big. If you were willing to run a TQ then the 360 manifold is perfect.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: 340 vs 360 4bbl intake
[Re: DEMONSIZZLER]
#149147
11/11/08 10:22 PM
11/11/08 10:22 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
ThermoQuad carbs have the following strong points:
2)keep the fuel about 25+ degrees cooler in summer heat which translates to more power(phenoilc bowl)
My own experience (from back when they were new) is that Thermoquads are significantly more prone to vapor lock than Holleys. And that's even with the insulator/gasket you're supposed to run under them. Without that, they'll hardly run on a hot day.
I also didn't like the low power you had when only the the extremely small primary barrels were open, and the secondaries wouldn't open unless you gave it so much throttle that it kicked down a gear.
Other than that, I guess they were OK. 
As for the original question, I'd look for a used Performer aluminum intake for a better match with the 318 ports plus 30 pounds of dead weight off the front end.
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Re: 340 vs 360 4bbl intake
[Re: 69L78Nova]
#149149
11/12/08 09:38 AM
11/12/08 09:38 AM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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I have run plenty 318s with 360 intakes yes its a little mis matched,cant really notice it from the seat dyno though and I 2nd the Q-jet,that will get the throttle responce back some and feed it plenty o gas the main thing with slapping a 4-v on a teen is the little cam dont like it but you will notice a gain in performance,same with swapping 360 heads on a stock teen...the cam cant feed the flow swap the cam to some thing alittle bigger allways helps I would suggest an LD4B intake and the square bore carb you have,its on par with a LD340 intake but for the 318 ports and get over the thermo bog...quadra bog...holley gas hole thing....run what ya brung send all q-Jets to me please 
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Re: 340 vs 360 4bbl intake
[Re: GTX MATT]
#149151
11/12/08 10:50 AM
11/12/08 10:50 AM
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Joined: May 2003
Posts: 15,487
Florida
scratchnfotraction
I Live Here
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I Live Here
Joined: May 2003
Posts: 15,487
Florida
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I used to have a sticker on the window of a 68 road runner from holley it was black and red said holley gas holes,showed a monstrus holley carb no air horn just 4 great big holes with the discharge nozzels not for gas milage for sure OH! I ment to say quada junk not quadra bog...my bad!  
Last edited by scratchnfotraction; 11/12/08 10:53 AM.
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