ROCHESTER QJM5.7LMC Quadrajet Carburetor Carb Core QJM5.7MC 744502

( Manufacturer Part Number: QJM5.7LMC ), ( Type: Carburetor ), ( Mounting Flange Type: Spread Bore ), ( Oe/oem Part Number: 7044502 ), ( Features: Quadrajet )

Review ROCHESTER Quadrajet Carburetor Carb# Core Parts fits MARINE 350 454

The Rochester QJM5.7LMC Quadrajet Marine Carburetor is a high-performance fuel delivery system specifically designed for marine applications. This carburetor, with the part number 744502, is suitable for use with 350 and 454 cubic inch engines.

The Quadrajet design of this carburetor features a sophisticated fuel delivery system that utilizes four separate jets to atomize fuel, ensuring a precise and consistent fuel-air mixture for optimal engine performance. The QJM5.7LMC is engineered to deliver superior throttle response, improved idle stability, and enhanced fuel economy, making it an excellent choice for marine applications where power and efficiency are crucial.

This marine carburetor is manufactured with marine-grade materials, ensuring durability and longevity in the harsh marine environment. Its construction includes corrosion-resistant components such as stainless steel fuel lines and brass fuel bowls, which help to prevent rust and other forms of corrosion.

The QJM5.7LMC Quadrajet Marine Carburetor is easy to install and comes with a comprehensive installation kit that includes all necessary hardware. It also features an adjustable idle mixture control, allowing users to fine-tune the carburetor for optimal engine performance in various operating conditions.

This Rochester carburetor is designed to meet the unique demands of marine applications, providing reliable and efficient fuel delivery for boats of all sizes. With its powerful Quadrajet design, durable marine-grade construction, and adjustable idle mixture control, the Rochester QJM5.7LMC Quadrajet Marine Carburetor is an excellent choice for boat owners seeking to improve the performance and efficiency of their marine engines.

The Rochester Quadrajet QJM5.7LMC/QJM5.7MC carburetor is a popular choice for marine applications, particularly for engines like the 350 and 454 cubic inch models. Here are some pros and cons to help you make an informed decision on whether to buy this carburetor:

1. Fuel Efficiency: The Quadrajet design offers excellent fuel efficiency, which is crucial for marine applications where fuel availability may be limited.

2. Smooth Idle and Throttle Response: This carburetor is known for its smooth idle and throttle response, which can make your marine engine run more smoothly and quietly.

3. Easy to Install: The Quadrajet design is relatively simple, making it easier to install compared to some other marine carburetors.

4. Robust Design: The Quadrajet is a durable carburetor that can withstand the harsh marine environment, including exposure to saltwater and UV rays.

5. Wide Availability: The Quadrajet is a widely used carburetor, which means that parts and expertise are readily available if needed.

1. Complexity: While the Quadrajet design offers many benefits, it can also be more complex to tune compared to simpler carburetors. This may require additional time and expertise.

2. Cost: The Quadrajet can be more expensive than some other marine carburetors, particularly if you're looking for a rebuilt or new unit.

3. Limited Adjustability: Some users have reported that the Quadrajet offers limited adjustability, which may make it less suitable for certain applications.

The Rochester Quadrajet QJM5.7LMC/QJM5.7MC carburetor offers many benefits for marine applications, including fuel efficiency, smooth operation, and durability. However, it can also be more complex to tune and may be more expensive than some other options. Ultimately, the decision to buy this carburetor will depend on your specific needs and budget. If you value fuel efficiency, smooth operation, and durability, and are willing to invest in the time and expertise required to tune the carburetor, then the Quadrajet may be a good choice for you. Alternatively, if you're looking for a simpler and more affordable option, you may want to consider other carburetor models.

If you're considering purchasing the Rochester Quadrajet QJM5.7LMC/QJM5.7MC carburetor for your marine application, I would recommend doing thorough research on the specific model you're considering and the requirements for tuning it. Additionally, consider consulting with a marine engine expert or a reputable carburetor rebuilder to ensure that you're getting the best possible performance from your new carburetor. Finally, be prepared for the potential costs associated with tuning and maintenance, and consider the long-term benefits of fuel efficiency and durability when making your decision.

Details:

It has been on my shelf for a few years. It would fit other 350 and 454 crusader OMC Marine engines has the original Rochester numbers 7044502 stamped on housing. This was removed from a running crusader 350 Ci Chevrolet engine. Rochester quadrajet Marine 4 barrel carburetor National Carburetors part number QJM5.7LMC.

It is a great carburetor for rebuild or parts.

part #: qjm57lmc price

• $59.95

specifications carbcoon:

• for models: Marine, 350, 454
• for makes: Rochester
• mpn: Qjm5.7lmc
• type: Carburetor
• mounting flange type: Spread Bore
• oe/oem part number: 7044502
• features: Quadrajet

seller carbcoon:

• rating: 100.0%
• # reviews: 1274
• city: Belchertown, Massachusetts

payments carbcoon:

• other
• wallet: Google-pay
• credit card: Discover

shipping carbcoon:

• class: Standard
• transit: 4-9 Days
• carrier: USPS
• cost: $14.58
• service: USPS Ground Advantage
• type: Calculated

general carbcoon:

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

offer carbcoon:

• started: February 22, 2026
• options: Ship-to-home
• quantity: 1
• sold: 0
• availability: In Stock

returns carbcoon:

• policy: No Returns

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