MERCURY 57-861049-1 Mpi Gm Boat Engine Serpentine Belt 7.4 V8

( Manufacturer Part Number: 57-861049-1 ), ( Part Type: Engine Belt ), ( Country Of Origin: United States )

Review MERCURY 7.4 Mpi V8 Gm Boat Engine Serpentine Belt fits MERCRUISER MARINE 454

The Mercury 57-861049-1 Mercruiser 7.4 MPI 454 V8 GM Marine Boat Engine is a powerful and efficient powerhouse designed for your watercraft. This engine is part of the Mercury 7.4L Big Block V8 series, known for its superior performance and reliability.

The 7.4 MPI 454 V8 engine is equipped with a Multi-Port Fuel Injection system, which optimizes fuel delivery for maximum power and efficiency. This results in a quick response and smooth operation, even under heavy load.

The engine comes with a serpentine belt drive system, which simplifies the belt routing and reduces the overall engine size. The serpentine belt drives the accessories such as the alternator, water pump, and power steering pump. The belt is made of high-quality materials for durability and long life, ensuring reliable operation of the engine accessories.

The 7.4 MPI 454 V8 engine features a displacement of 7.4 liters and a bore and stroke of 4.0 inches x 3.4 inches. It delivers an impressive 454 horsepower at 5800 RPM and 545 lb-ft of torque at 4200 RPM. This power output makes it an ideal choice for high-performance boats and large commercial applications.

The engine is designed to meet the latest emissions regulations, including EPA and CARB certifications. It uses advanced technologies such as electronic fuel injection, electronic ignition, and closed-loop exhaust gas recirculation system to minimize emissions and improve fuel efficiency.

The Mercury 57-861049-1 Mercruiser 7.4 MPI 454 V8 engine is built with a heavy-duty aluminum block and cylinder heads, providing excellent cooling and durability. It also features a forged crankshaft and pistons, which ensure long-lasting performance even under heavy use.

The engine comes with a comprehensive warranty, including a three-year limited warranty on the engine and a five-year limited warranty on the block. This gives you peace of mind and assurance that your investment is protected.

In summary, the Mercury 57-861049-1 Mercruiser 7.4 MPI 454 V8 engine is a high-performance and efficient power solution for your marine applications. Its advanced technologies, durable design, and reliable operation make it an excellent choice for powering your boat or commercial watercraft.

Mercury 57-861049-1 (Mercruiser 7.4 MPI 454 V8) Serpentine Belt: A Detailed Analysis

The Mercury 57-861049-1 is a serpentine belt designed for the Mercruiser 7.4 MPI 454 V8 marine engine. In this analysis, we will discuss its key features, advantages, and disadvantages to help boat owners make an informed decision about whether to purchase this particular belt.

1. Designed specifically for the Mercruiser 7.4 MPI 454 V8 engine.

2. Made of high-quality materials for durability and reliability.

3. Utilizes a serpentine belt system for improved power transmission and simplified belt replacement.

1. Improved power transmission: The serpentine belt design enables more efficient power transmission between the engine and various accessories, resulting in better overall performance.

2. Simplified belt replacement: With a single serpentine belt, replacing it is much easier and quicker than dealing with multiple belts.

3. Enhanced reliability: The Mercury 57-861049-1 belt is made from high-quality materials, ensuring it lasts longer and performs consistently under harsh marine conditions.

1. Higher cost: Compared to traditional V-belts, serpentine belts can be more expensive.

2. Limited availability: Although widely used in automotive applications, serpentine belts in marine engines might not be as readily available in local parts stores.

The Mercury 57-861049-1 serpentine belt offers several advantages, such as improved power transmission, simplified belt replacement, and enhanced reliability. However, its higher cost and limited availability might be considered disadvantages for some boat owners. Ultimately, the decision to purchase this belt depends on individual priorities, budget, and access to replacement parts.

If you value the benefits of a serpentine belt system, such as simplified replacement and improved power transmission, and are willing to pay a slightly higher price, the Mercury 57-861049-1 serpentine belt is a solid choice for your Mercruiser 7.4 MPI 454 V8 marine engine. However, if cost is a concern, you might consider investigating alternative belt options or focusing on preventative maintenance to extend the life of your existing belt.

Details:

Thanks -Mike. I will do my best to resolve the issue. Shelf 25-2-3-C. What you see in the pictures is what get.

Condition: Good used condition. Look at pictures closely and ask any questions, I try to describe parts as best can. Part was removed from a MerCruiser 7.4 MPI Marine engine. Mounting hardware is only included if it shown in the pictures.

Please look at all pictures and read entire before buying.

part #: 578610491 prices

• $39.00-$72.99

specifications otsterndriv:

• for models: Marine, 454, Mercruiser
• for makes: Mercury
• mpn: 57-861049-1
• part type: Engine Belt
• country of origin: United States

returns otsterndriv:

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

general otsterndriv:

• Boat Parts > Sterndrive Motors Components > Other
• condition: Used

offer otsterndriv:

• sold: 0
• availability: In Stock
• options: Ship-to-home
• started: December 4, 2025
• quantity: 1

payments otsterndriv:

• credit card: Diners-club
• other
• wallet: Apple-pay

seller otsterndriv:

• # reviews: 113784
• city: Huron, Ohio
• rating: 99.5%

shipping otsterndriv:

• class: Standard, Expedited
• carrier: USPS, FedEx
• service: USPS Ground Advantage, USPS Priority Mail, FedEx Ground / FedEx Home Delivery, USPS Priority Mail Express
• cost: $16.90
• transit: 4-8 Days
• type: Calculated

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