Previous Thread
Next Thread
Print Thread
carb selection #499133
10/16/09 10:46 PM
10/16/09 10:46 PM
Joined: Sep 2009
Posts: 28
Hurricane, WV
M
moparsrule Offline OP
member
moparsrule  Offline OP
member
M

Joined: Sep 2009
Posts: 28
Hurricane, WV
I have a stock 74 360 with a newly rebuilt thermaquad that I am not having good luck with and want to replace it. I am thinking of going with a Holley replacement carb that I think is 670 cfm. Can anybody give me any suggestions on this carb or any others that may work better.

Re: carb selection [Re: moparsrule] #499134
10/17/09 01:09 AM
10/17/09 01:09 AM
Joined: Jan 2007
Posts: 352
Arizona
6
69rrgrabber Offline
enthusiast
69rrgrabber  Offline
enthusiast
6

Joined: Jan 2007
Posts: 352
Arizona
The Thermoquads are difficult to tune compared to say a Holley or Carter. For a stock 360 mild performance street motor, 600 cfm will give you more throttle response in general and better mileage. Many people like the Edlerbrock 600, but the 750s have problems. The Holleys are good too and if you get one you will want a vacuum secondary version single pumper.

CAC


"It takes a Mopar to catch a Mopar!" 1969 Charger R/T 440 1969 Road Runner 383 1970 Cuda 440
Re: carb selection [Re: moparsrule] #499135
10/17/09 01:45 AM
10/17/09 01:45 AM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
R
RapidRobert Offline
Circle Track
RapidRobert  Offline
Circle Track
R

Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
I'd send it to Demonsizzler in Stone Mountain Georgia & have him nurse it back to health. He's our resident thermoquad guru & you wouldn't end up with an extra carb.


live every 24 hour block of time like it's your last day on earth
Re: carb selection [Re: RapidRobert] #499136
10/17/09 01:58 AM
10/17/09 01:58 AM
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT Offline
Management Trainee
1_WILD_RT  Offline
Management Trainee

Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
Quote:

I'd send it to Demonsizzler in Stone Mountain Georgia & have him nurse it back to health. He's our resident thermoquad guru & you wouldn't end up with an extra carb.




Thermoquads are very capable carbs, mileage & performance when set-up correctly.. Demonsizzler actually knows the carb, most guys that "rebuild" them are changing parts with little idea how the carb actually works & what little tweeks improve the carb vs cost mileage...

Re: carb selection [Re: 1_WILD_RT] #499137
10/17/09 09:28 AM
10/17/09 09:28 AM
Joined: Sep 2009
Posts: 28
Hurricane, WV
M
moparsrule Offline OP
member
moparsrule  Offline OP
member
M

Joined: Sep 2009
Posts: 28
Hurricane, WV
I like the Therma Quad carb but I am getting sick of working on this one. I had it rebuilt, cost me $150 and that helped but it is still not right. The Holley replacement carb at the local parts store is a 670cfm that is what they say it takes but I didn't know if that is to much carb for a stock rebuilt 360, it may be 30 over but stock cam.

Re: carb selection [Re: moparsrule] #499138
10/17/09 09:35 AM
10/17/09 09:35 AM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
R
RapidRobert Offline
Circle Track
RapidRobert  Offline
Circle Track
R

Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
670 is not too much for your stock 360. And it's definitely the carb that is the culprit?


live every 24 hour block of time like it's your last day on earth
Re: carb selection [Re: RapidRobert] #499139
10/17/09 09:51 AM
10/17/09 09:51 AM
Joined: Sep 2009
Posts: 28
Hurricane, WV
M
moparsrule Offline OP
member
moparsrule  Offline OP
member
M

Joined: Sep 2009
Posts: 28
Hurricane, WV
Yes I think the culprit is the carb. It has a small leak on the pass. side outside of carb, after I shut the car off it seems to drip fuel in because I can see vapors coming out of the top and if it sits for a few minutes I have to hold the gas pedal to the floor for it to start. And I was driving it the other day around the block and it wants to load up bad and smokes black, if I rev the engine it will straighten up for a little bit. I have tried to adjust the carb with no luck.

Re: carb selection [Re: moparsrule] #499140
10/17/09 11:06 AM
10/17/09 11:06 AM
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
J
joedust451 Offline
super gas
joedust451  Offline
super gas
J

Joined: Feb 2005
Posts: 5,221
Branson, Mo.
Quote:

Yes I think the culprit is the carb. It has a small leak on the pass. side outside of carb, after I shut the car off it seems to drip fuel in because I can see vapors coming out of the top and if it sits for a few minutes I have to hold the gas pedal to the floor for it to start. And I was driving it the other day around the block and it wants to load up bad and smokes black, if I rev the engine it will straighten up for a little bit. I have tried to adjust the carb with no luck.




Throttle shafts are worn, its common on these old TQs, also sounds like the main body is worpt, your best bet is a 600 VS if your staying stock.


75 Duster, 451 10.87 @ 123.58 NA 97 Z28 6sp., 12.01 @ 115 on a 100 shot 71 Swinger. 360 magnum. 12.58 @ 105 78 cutlass, 469 BBC. 12.70 @ 108 on street tires. http://www.youtube.com/watch?v=Z2kqNmMfheU






Powered by UBB.threads™ PHP Forum Software 7.7.1