GM 12740077 Engine

( Brand: Gm ), ( Manufacturer Part Number: 12740077 ), ( Part Type: Engine ), ( Genuine Oem: Yes ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Direct Replacement ), ( Replaces Part Number: 12699313 )

Review GM Genuine Engine

GM 12740077 Engine Overview

The GM 12740077 engine, also known as the 4.3L V6 powerplant, is a versatile and powerful engine produced by General Motors. Designed for durability and efficiency, this engine is an excellent choice for various automotive applications.

The heart of this engine is its aluminum L31 block, which is known for its strong and lightweight design. The engine features a compact combustion chamber, allowing for excellent power output and quick response. The 4.3L V6 engine boasts a displacement of 261 cubic inches (4,268 cubic centimeters) and produces a maximum horsepower of 190 4,400 RPM and maximum torque of 235 lb-ft 3,200 RPM.

The engine is equipped with a multi-port fuel injection system, which optimizes fuel delivery for improved combustion efficiency and reduced emissions. The intake manifold is designed to enhance airflow and fuel distribution for better performance and fuel economy.

The 4.3L V6 engine is also equipped with a variable valve timing system, which allows the engine to adapt to driving conditions for optimal power and efficiency. This system uses hydraulic actuators to adjust the timing of the intake and exhaust valves, providing a more responsive and flexible engine.

The engine is mated to a robust 4L60E four-speed automatic transmission, which offers smooth and efficient power delivery. The transmission features a low first gear for powerful acceleration and a wide overdrive range for quiet and fuel-efficient cruising.

The GM 12740077 engine is known for its durability and reliability, thanks to its robust design and advanced engineering. The engine block and cylinder heads are made of aluminum and iron, respectively, providing excellent heat dissipation and durability. The engine also features a cast-iron crankshaft, steel connecting rods, and forged pistons for exceptional strength and durability.

In conclusion, the GM 12740077 engine is a powerful and efficient powerplant that delivers impressive performance and reliability. With its advanced features, including a compact combustion chamber, multi-port fuel injection system, variable valve timing system, and robust transmission, this engine is an excellent choice for various automotive applications.

Buying a GM 12740077 engine, also known as the 3.6L V6 LGX engine, comes with its own set of advantages and disadvantages. Let's examine each in detail.

1. Reliable: This engine is known for its durability and reliability. It has a robust design and can handle heavy use, making it a popular choice for commercial applications.

2. Fuel Efficiency: The 3.6L V6 LGX engine delivers decent fuel economy. According to GM, it can achieve up to 28 mpg on the highway.

3. Power: The engine produces a decent amount of power, with 310 horsepower and 271 lb-ft of torque.

4. Versatile: This engine is used in a variety of GM vehicles, including SUVs, trucks, and vans, making it a versatile option for different applications.

1. Cost: The price of a new GM 12740077 engine can be quite high, making it a significant investment for some.

2. Complexity: This engine is complex, with many components and systems, which can make repairs and maintenance more expensive and time-consuming.

3. Emissions: The 3.6L V6 LGX engine produces a significant amount of emissions, making it less eco-friendly than some other options on the market.

4. Availability: Due to its popularity, availability of a new GM 12740077 engine can be limited, especially during peak demand periods.

The GM 12740077 engine offers a reliable, powerful, and fuel-efficient option for those in need of a versatile V6 engine. However, its high cost, complexity, emissions, and limited availability are important considerations.

If you are in the market for a new engine and the GM 12740077 fits your specific needs and budget, then it is a solid choice. However, it's always a good idea to explore other options and consider factors such as fuel efficiency, power, reliability, and availability before making a final decision. Additionally, considering a rebuilt or used engine may offer a more cost-effective solution.

Details:

Electrical parts are not returnable. Parts must be resalable and in the original packaging

Silverado, Sierra 3500 HD. Shipping Carrier substitutions may be made at our determination in an attempt to reduce shipping cost the customer. Genuine GM Engine 12740077:: Silverado, Sierra 2500 HD.

part #: 12740077 prices

• $11233.50-$11876.99

specifications grokengines:

• brand: Gm
• mpn: 12740077
• part type: Engine
• genuine oem: Yes
• manufacturer warranty: 1 Year
• fitment type: Direct Replacement
• replaces part number: 12699313

offer grokengines:

• quantity: 1
• availability: In Stock
• options: Ship-to-home
• started: January 8, 2026
• sold: 0

returns grokengines:

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

seller grokengines:

• # reviews: 32
• city: Heber Springs, Arkansas
• rating: 100.0%

shipping grokengines:

• service: Flat Rate Freight
• cost: $236.00
• class: Freight
• type: Fixed

general grokengines:

• Car Truck Parts Accessories > Engines Engine Parts > Engines
• condition: New

payments grokengines:

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

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