Thermoquad Choice

House of Darts · 12-31-2010, 09:11 PM

The '75-75 360 has a number of thermoquads listed., Anyone better than the others? Thanks

Philip Saran · 01-01-2011, 12:10 AM

You might want to contact Mike Graham, GTX John or Kenny Etter here on the board,
They all have quite alot of experience with the TQ

Jim Wahl · 01-01-2011, 02:47 AM

Since you must run the 1.50" primary TQ, I would recommend the 6138S or 6139S. These are the simplest and run very well. The are from the '72 340 auto or stick application. Jim

GTX JOHN · 01-01-2011, 07:00 AM

Jim: Those # are both SMALL 1 3/8 primaries I believe...... not 1 1/2 like the 360 are allowed to run.
Not a lot of difference between big and little carbs in performance but we ourselves run a big one on applications that are allowed either size which are quite a few according to NHRA tech specs. We like the 6138 or 6340 on any 340 combination either High or Low Compression and I have a bunch of both.

Jim Wahl · 01-01-2011, 01:49 PM

Right John, what I meant to say was even though he can run the 1.50" primary I would still recommend the #6138S if NHRA will allow it. That series carb is built most like the competition series carb than the rest of them. I have found on back to back runs that the 1.50" primary is not worth more than .01 or .02 over the 1 3/8" primary carb in the best of conditions. Jim

GTX JOHN · 01-03-2011, 04:51 AM

I complete agree with you Jim about the difference not being a whole lot. However my oldest boy Robert lost the class final in Vegas Nat's last year by .0001.....he was not happy with me. A few years before I won a Heads Up Round in Denver Nat'ls by .0001. There have been days I would Kill for a hundredth in Class!

John Irving

12-31-2010, 09:11 PM	#1
House of Darts Member Join Date: Mar 2007 Posts: 346 Likes: 19 Liked 20 Times in 15 Posts	Thermoquad Choice The '75-75 360 has a number of thermoquads listed., Anyone better than the others? Thanks

01-01-2011, 12:10 AM	#2
Philip Saran Senior Member Join Date: Oct 2006 Location: Parker, CO. Posts: 728 Likes: 163 Liked 14 Times in 11 Posts	Re: Thermoquad Choice You might want to contact Mike Graham, GTX John or Kenny Etter here on the board, They all have quite alot of experience with the TQ __________________ Phil Saran Parker, Colorado

01-01-2011, 02:47 AM	#3
Jim Wahl Veteran Member Join Date: Jan 2002 Location: Central Florida Posts: 5,843 Likes: 666 Liked 683 Times in 129 Posts	Re: Thermoquad Choice Since you must run the 1.50" primary TQ, I would recommend the 6138S or 6139S. These are the simplest and run very well. The are from the '72 340 auto or stick application. Jim __________________ Jim Wahl....NHRA #2239 S/SS - IHRA # 8 Stock, D2 Stock Champion (forever I guess) 2019 Baby Gators Stock Champion 2009 D2 National Open Stock Champion 1981 D2 West Palm Beach LDRS SS Runner Up Past President, Southern Stock / Super Stock Association.

01-01-2011, 07:00 AM	#4
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,720 Likes: 2,770 Liked 2,435 Times in 688 Posts	Re: Thermoquad Choice Jim: Those # are both SMALL 1 3/8 primaries I believe...... not 1 1/2 like the 360 are allowed to run. Not a lot of difference between big and little carbs in performance but we ourselves run a big one on applications that are allowed either size which are quite a few according to NHRA tech specs. We like the 6138 or 6340 on any 340 combination either High or Low Compression and I have a bunch of both.

01-01-2011, 01:49 PM	#5
Jim Wahl Veteran Member Join Date: Jan 2002 Location: Central Florida Posts: 5,843 Likes: 666 Liked 683 Times in 129 Posts	Re: Thermoquad Choice Right John, what I meant to say was even though he can run the 1.50" primary I would still recommend the #6138S if NHRA will allow it. That series carb is built most like the competition series carb than the rest of them. I have found on back to back runs that the 1.50" primary is not worth more than .01 or .02 over the 1 3/8" primary carb in the best of conditions. Jim __________________ Jim Wahl....NHRA #2239 S/SS - IHRA # 8 Stock, D2 Stock Champion (forever I guess) 2019 Baby Gators Stock Champion 2009 D2 National Open Stock Champion 1981 D2 West Palm Beach LDRS SS Runner Up Past President, Southern Stock / Super Stock Association. Last edited by Jim Wahl; 01-01-2011 at 01:54 PM.

01-03-2011, 04:51 AM	#6
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,720 Likes: 2,770 Liked 2,435 Times in 688 Posts	Re: Thermoquad Choice I complete agree with you Jim about the difference not being a whole lot. However my oldest boy Robert lost the class final in Vegas Nat's last year by .0001.....he was not happy with me. A few years before I won a Heads Up Round in Denver Nat'ls by .0001. There have been days I would Kill for a hundredth in Class! John Irving