ROCHESTER 7040247 Quadrajet Carburetor Riviera V-8

( Brand: Rochester ), ( Manufacturer Part Number: 7040247 ), ( Type: Carburetor ), ( Features: Quadrajet )

Review ROCHESTER Quadrajet Carburetor Buick Riviera V-8 #7040247 Parts fits 455 1970

The Rochester Quadrajet Carburetor, model 7040247, is a legendary fuel delivery system specifically designed for the 1970 Buick Riviera equipped with a 455 Cubic Inch V-8 engine. This quadrajet carburetor is renowned for its ability to deliver a smooth and efficient fuel mixture to the engine, ensuring optimal performance and excellent fuel economy.

The Quadrajet carburetor features four separate barrels, each with its own individual choke and throttle circuit. This design allows for precise fuel metering and delivery, resulting in improved idle stability and reduced emissions. Each barrel is equipped with a float-fed system that maintains a constant fuel level, ensuring a consistent fuel supply to the engine.

The Quadrajet carburetor also includes an automatic choke system that provides quick and reliable starting in various weather conditions. The choke mechanism utilizes an electric solenoid to enrich the fuel mixture during engine start-up, ensuring a smooth transition from idle to acceleration.

One of the most notable features of the Rochester Quadrajet Carburetor is its secondary throttle plates, which are designed to open during deceleration and overrun conditions. This feature allows excess fuel to be returned to the float bowls, reducing fuel vaporization and improving overall fuel economy.

The Quadrajet carburetor is also easy to tune and maintain, with accessible adjustments for idle mixture, idle speed, and main jet size. The carburetor is housed in a durable cast aluminum body, which provides excellent heat dissipation and protection from the elements.

In summary, the Rochester Quadrajet Carburetor, model 7040247, is a high-performing and efficient fuel delivery system designed specifically for the 1970 Buick Riviera 455 V-8 engine. Its advanced design features, such as four separate barrels, automatic choke, and secondary throttle plates, ensure optimal performance, improved fuel economy, and easy tunability.

The Rochester Quadrajet carburetor, model 7040247, was originally designed for use in 1970 Buick Riviera 455 V-8 engines. This carburetor is a four-barrel design, which means it has four separate intake runners, each with its own barrel and choke. Here are some pros and cons of buying this carburetor for your 1970 Buick Riviera 455 V-8:

1. Excellent fuel economy: The Quadrajet carburetor is known for its fuel efficiency. It was designed to provide a good air/fuel mixture, which results in better fuel economy compared to other carburetors of the same era.

2. Easy to tune: The Quadrajet carburetor is relatively easy to tune, which is a significant advantage for DIY enthusiasts. It has a simple design and adjustable components, making it possible to achieve optimal performance with some effort and knowledge.

3. Good power output: The Quadrajet carburetor can provide good power output, especially when it is properly tuned. It is capable of delivering a decent amount of horsepower and torque, making it a popular choice for muscle car enthusiasts.

4. Durable construction: The Quadrajet carburetor is known for its robust construction. It is made from high-quality materials, and its design is simple yet effective. It can withstand the rigors of high-performance driving and can last for a long time with proper care and maintenance.

1. Complexity: The Quadrajet carburetor is more complex than some other carburetors of the same era. Its four-barrel design requires more adjustments and fine-tuning to achieve optimal performance.

2. Fuel quality issues: The Quadrajet carburetor can be sensitive to the quality of fuel. It may not perform optimally with low-quality or contaminated fuel, which can result in poor engine performance and potential damage to the carburetor.

3. Availability of parts: Finding replacement parts for the Quadrajet carburetor can be challenging, especially for older models like the 7040247. This can make repairs and maintenance more difficult and expensive.

4. Cost: The Quadrajet carburetor can be more expensive than some other carburetors of the same era. Its complex design and high-quality construction contribute to its higher cost.

The Rochester Quadrajet carburetor, model 7040247, is a capable and reliable carburetor for 1970 Buick Riviera 455 V-8 engines. It offers excellent fuel economy, good power output, and is relatively easy to tune. However, its complexity, sensitivity to fuel quality, availability of parts, and cost are potential drawbacks. If you are willing to invest the time and effort required to properly tune and maintain this carburetor, it can provide excellent performance and longevity. Alternatively, if you prefer a simpler and more affordable carburetor, you may want to consider other options. Ultimately, the decision to buy a Quadrajet carburetor for your 1970 Buick Riviera 455 V-8 depends on your personal preferences, budget, and willingness to invest in the necessary time and resources.

Details:

Shipping is FREE for USA only. This is a parts carburetor. Nothing is seized but it has an incorrect throttle base Oldsmobile. And missing some choke parts. It is a commercial rebuilt that was used.

You are buying on a Rochester Quadrajet four-barrel carburetor from 1970 Buick Riviera 455 V-8, stamped P/N #7040247, date code LA 0340.

part #: 7040247 prices

• $36.70-$299.95

specifications carbcoon:

• for models: 455
• for makes: Buick, Rochester
• for years: 1970
• brand: Rochester
• mpn: 7040247
• type: Carburetor
• features: Quadrajet

payments carbcoon:

• wallet: Paypal
• other
• credit card: Mastercard

general carbcoon:

• condition: For parts or not working
• Car Truck Parts Accessories > Air Fuel Delivery > Carburetors

seller carbcoon:

• rating: 100.0%
• # reviews: 13363
• city: Rumford, Rhode Island

shipping carbcoon:

• service: Standard
• transit: 4-7 Days
• class: Standard
• cost: $0.00
• type: Fixed

returns carbcoon:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

offer carbcoon:

• options: Ship-to-home
• availability: In Stock
• quantity: 1
• sold: 0
• started: December 11, 2025

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