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  3. MOPAR 6138S

MOPAR 6138S Thermoquad Carburetor Manual Demon

fits model: 340, Cuda, Challenger. make: Dodge, Plymouth, Mopar. year: 1972.

6138s Mopar Dodge Plymouth 1972 340 Thermoquad Carburetor Manual 4 Speed Cuda Challenger Demon

( Brand: Mopar ), ( Manufacturer Part Number: 6138S ), ( Choke Type: Mechanical ), ( Type: 4 Speed Manual Carburetor ), ( Mounting Flange Type: Spread Bore ), ( Features: Thermoquad ), ( Material: Aluminum, Phenolic Resin ), ( Vintage Part: Yes ), ( Country Of Origin: United States )

Review MOPAR Dodge Plymouth Thermoquad Carburetor Manual Speed Demon fits CUDA CHALLENGER 340 1972

The Mopar 6138S 1972 340 Thermoquad Carburetor is a legendary component of the iconic Dodge Cuda, Challenger, and Demon muscle cars of the early 1970s. This carburetor, manufactured by Holley, is a four-barrel design that delivers superior performance and fuel efficiency.

The Thermoquad name refers to the unique design of the carburetor, which includes a thermostat-controlled air temperature sensor. This sensor monitors the intake air temperature and adjusts the carburetor's fuel mixture accordingly, ensuring optimal performance in various temperature conditions.

The 6138S carburetor features a four-barrel design, each barrel equipped with a Thermoquad quad-stack design. The Thermoquad system consists of four individual throttle bodies, each with its own idle jet, main jet, power jet, and secondary jet. These jets are adjustable, allowing for fine-tuning of the fuel mixture for different driving conditions.

The primary jets are controlled by a vacuum secondary system, which provides an additional fuel mixture for high RPM operation. This design ensures a smooth power band and excellent throttle response. The carburetor also includes an electric choke, making cold starts easier and more reliable.

The base plate of the 6138S carburetor is designed to be adaptable to various engine applications. It includes mounting bosses for various engine mounting configurations, allowing for easy installation on a wide range of engines. Additionally, the carburetor includes a heavy-duty float bowl gasket and a baffled float bowl to minimize fuel slosh and improve fuel distribution.

The 6138S Thermoquad Carburetor is a high-performance component that requires precise tuning and maintenance. It includes a detailed instruction manual, which outlines the steps for installation, adjustment, and tuning. The manual includes specifications for various engine applications, making it an essential resource for restoring or building a high-performance Mopar muscle car. With its unique Thermoquad design, the 6138S carburetor offers reliable and consistent performance, making it a popular choice among enthusiasts and collectors.

Buying a Mopar Dodge Plymouth 6138S 1972 340 Thermoquad Carburetor for a Cuda, Challenger, or Demon: A Detailed Analysis

Introduction:

The Mopar Dodge Plymouth 6138S 1972 340 Thermoquad Carburetor is a popular choice among enthusiasts restoring or upgrading their classic Cuda, Challenger, or Demon muscle cars. This carburetor is known for its improved performance and fuel efficiency. In this analysis, we will discuss the pros and cons of purchasing this carburetor, ending with a conclusion and recommendation.

Pros:

1. Enhanced Performance: The Thermoquad design ensures better fuel mixture and more efficient combustion, resulting in improved engine performance.

2. Fuel Efficiency: The carburetor's ability to provide a more precise fuel mixture can lead to better fuel economy, especially for those driving their muscle cars regularly.

3. Easier Idle and Cold Start: The Thermoquad design helps maintain a stable idle and provides easier cold starts, making the car more drivable in various conditions.

4. Retro Fitment: The 6138S carburetor is a direct replacement for original 600 series Carter carburetors, ensuring a seamless fitment in classic Mopar muscle cars.

5. Adjustability: The Thermoquad carburetor offers multiple adjustment points, allowing users to fine-tune the carburetor to their specific engine and driving conditions.

Cons:

1. Complexity: The Thermoquad carburetor is more complex than a standard single or double barrel carburetor, which may require additional expertise and resources for installation and tuning.

2. Cost: The 6138S Thermoquad carburetor is more expensive than a standard carburetor, making it a significant investment for some enthusiasts.

3. Availability of Gaskets and Hardware: Finding the correct gaskets and hardware for installation can be a challenge, especially for older models.

4. Requires Proper Tuning: The Thermoquad carburetor requires precise tuning to achieve optimal performance, which may require additional resources and expertise.

Conclusion:

The Mopar Dodge Plymouth 6138S 1972 340 Thermoquad Carburetor offers several benefits, including enhanced performance, improved fuel efficiency, easier idle and cold start, and a seamless retro fitment. However, it also comes with its drawbacks, such as complexity, cost, availability of gaskets and hardware, and the need for proper tuning.

Recommendation:

For those seeking improved performance and fuel efficiency in their classic Mopar muscle cars, the 6138S Thermoquad carburetor is a worthwhile investment. However, it's essential to consider the associated complexities and costs, as well as the availability of gaskets and hardware. Proper research, planning, and expertise are crucial to ensure a successful installation and optimal performance.

In summary, the Mopar Dodge Plymouth 6138S 1972 340 Thermoquad Carburetor is an excellent choice for those looking to upgrade their classic muscle car's engine performance and fuel efficiency. However, it requires careful consideration and planning to ensure a successful installation and optimal performance.

Details:

See photos for factory part numbers and manufacturer stamping. Part number: 6138S. One of the top tube vents has a little bend. Factory original OEM Mopar part.

The butterflies, idle mixture screws, along with all other adjustment screws move freely. 1972 340 Thermoquad 6138S Carburetor Manual 4 Speed Mopar Dodge Barrel Cuda Challenger Dart Demon Charger Road Runner A B E Body. Please see photos for full condition details.

part #: 6138s prices

  • $78.00-$93.00

specifications carbcoon:

  • for models: 340, Cuda, Challenger
  • for makes: Dodge, Plymouth, Mopar
  • for years: 1972
  • brand: Mopar
  • mpn: 6138s
  • choke type: Mechanical
  • type: 4 Speed Manual Carburetor
  • mounting flange type: Spread Bore
  • features: Thermoquad
  • material: Aluminum, Phenolic Resin
  • vintage part: Yes
  • country of origin: United States

shipping carbcoon:

  • service: FedEx Ground / FedEx Home Delivery
  • carrier: FedEx
  • cost: $20.35
  • type: Calculated
  • transit: 3-6 Days
  • class: Standard

general carbcoon:

  • condition: Used
  • Car Truck Parts Accessories > Air Fuel Delivery > Carburetors

offer carbcoon:

  • started: May 1, 2026
  • sold: 0
  • availability: In Stock
  • quantity: 1
  • options: Ship-to-home

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  • rating: 99.9%
  • # reviews: 1135
  • city: Cedar Falls, Iowa
for models: 340, cuda, challenger, for makes: dodge, plymouth, mopar, for years: 1972, choke type: mechanical, type: 4 speed manual carburetor, mounting flange type: spread bore, features: thermoquad, vintage part: yes, country of origin: united states,
category: auto parts > car truck parts accessories > air fuel delivery > carburetors, material: aluminum, phenolic resin, sku: 11067597735442602,

Mopar 6138S Is Similar To:

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3 offers $78.00–$93.00 USD
  • Offer #1: $78.00 price + $0.00 shipping estimate = $78.00* total. PLYMOUTH VOLARE 1977. CHRYSLER CORDOBA 1975-1977.FREE SHIPPING
  • Offer #2: $93.00 price + $0.00 shipping estimate = $93.00* total. CHRYSLER INDUSTRIAL 440 6446S, 6518S. PLYMOUTH 1972-74 340, 360, 400, 440.FREE SHIPPING
  • Offer #3: $85.00 price + $0.00 shipping estimate = $85.00* total.FREE SHIPPING

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