Really an evolution of the long line of Carter four-barrels, the TQ was a break in tradition, moving from the square-bore configuration of the earlier AFB and AVS carbs to a spread bore layout similar to the Rochester Quadrajet. The original OEM ThermoQuad, debuting on the , was a unique unit with different castings, metering circuits, and tuning parts. These carbs are quite rare, and pretty much orphans today outside the world of authentic restorations. Subsequent carbs were produced in huge numbers, and saw only minor changes through rest of the production run.
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The Carter Thermoquad TQ is a large four barrel carburetor with small primaries and large secondary bores, referred to as a 'spreadbore' design. Thermoquads share the same flange as Rochester Quadrajets and Holley spreadbore carbs but use different flange gaskets. The main body or float bowl of the TQ is made of black phenolic plastic which is meant to keep the gasoline cooler than a conventional metal float bowl.
IHC used TQ's from Australian Fords also used these carbs in the late 70's and early 80's. A handy way of distinguishing large TQ carbs used on CID engines from those on small block Dodges is to look at the primary throttle plates. Small carbs use aluminum primary throttle plates, whereas the larger CFM carbs have steel primary throttle plates. Spec sheets for 's Chrysler carbs are here. A detailed discussion of the characteristics of the Thermoquad carburetor is here.
This excellent guide was written by Gary Lewallen and is reproduced here with his permission. Australian Thermoquads recovered from original website.
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Carter TQ. Carburetor Technical Information Thermoquad Background The Carter Thermoquad TQ is a large four barrel carburetor with small primaries and large secondary bores, referred to as a 'spreadbore' design. The carb was also produced in aftermarket versions up to cfm.
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