Why were Chargers built with different brand Carburetors?

[WingCharger]

Why could Chargers be built with 3 different brands of Carbs? I dont get why they were built with Carters, Holleys, or Thermoquads. Is there really much difference? Of the three, which is the most durable or reliable?

Holley was the only carburetor available in six pack right?

Was Thermoquad built only in four four barrel?

[Charger-Bodie]

the thermquad carb is a Carter. they just used what they felt worked well at the time for a particular application.

[71charger_fan]

The term Thermoquad wouldn't make sense if it was anything but a four barrel.

[Ghoste]

Cost and availability were often a big factor as well.  And yes, the Six Pack carbs were Holleys.

[John_Kunkel]

I always thought the use of the Thermobog (and later the Quadrapuke) was emissions related but the bouncing back and forth between Carter and Holley in the sixties and seventies was probably just a "spread the wealth" policy.

[Nacho-RT74]

Thermoquad also because isolates the gas from the high temp of engine, saving from some boiling.

Thermoquads were made at first for drag races, so anything with emisiion controls when began... then they become to get that stuff.

as I allways state, ( because my fav carb for HIPO street ) GREAT ONE if you have a perfect conditions plastic bowl ( what is the hard part ). Good mileage and great boost at full throttle due teh oversized rear throttles