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#1 |
Junior Member
Join Date: Jan 2015
Posts: 41
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I am attempting to build my own Thermo-quad for 72-73 340. I don't want anything on it I don't need
but, leave or modify everything I do. Is anybody willing to share any tips on successful modifications? Fuel pressure? Is the vacuum diaphragm on right rear necessary to regulating air door? Is converting to Holley jets and removing the metering rods from primary circuit the best? Is removing the choke S/S legal? Is a -6 inlet adequate for fuel delivery at say 530 HP? I've read about 40-50 HP differences in modified Thermo-quads so, there must be some things that work better than others. Thanks |
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#2 |
Member
Join Date: Sep 2006
Location: Kilgore TX
Posts: 432
Likes: 5
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#3 |
Junior Member
Join Date: Aug 2014
Location: finland
Posts: 45
Likes: 10
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I run 74 duster in ss/ja 360cid here in finland,.I have problem all the time with accelerate pump seal ring i have use blue and orange rubber,.When it gets race fuel it goes fat and after that wont work at all,.same times cant get engine runnin before I take the thermoguad at pieces and change the rubber,.here in europe we run unleaded racing vp fuel could this be the problem..thanks
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#4 |
VIP Member
Join Date: Feb 2009
Location: Dunnellon,FL
Posts: 1,103
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Contact Jim Wahl, he's very good with these carbs. He's a member here.
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Jim Rountree |
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#5 |
Live Reporter
Join Date: Oct 2004
Location: Hickory, Ky
Posts: 10,314
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Van Lant
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#6 |
Junior Member
Join Date: Nov 2007
Posts: 27
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Anyone have a sorce for thermoquad secondary jets
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#7 | |
Veteran Member
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![]() Quote:
Jim .
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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. ![]() |
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#8 |
Senior Member
Join Date: Feb 2002
Location: Southeast Michigan
Posts: 891
Likes: 64
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You can buy the good accelerator pump seals from Ninja Fuel Systems on eBay . Compatible with ethanol laced fuel .
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#9 |
VIP Member
Join Date: Jun 2009
Location: Boulder City, Nevada 89005
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Holley Jets make it a lot easier to tune because readily available.
No metering rods make it a lot quicker to disassemble and assemble as they are a pain. Choke must remain in Carb. -6 works fine...Big float bowl capacity Diaphragm not vital but helpful in controlling Air Door. My opinions.......Your results may vary.
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John Irving 741 Stock 741 Super Stock Last edited by GTX JOHN; 03-04-2017 at 11:43 PM. |
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#10 |
Junior Member
Join Date: Nov 2007
Posts: 27
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Do you have holly jets in the secondarys, or only in the primarys
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