GM TRUCKS 12660312 Engine 5.3L V-8

( Brand: Gm Trucks ), ( Manufacturer Part Number: 12660312 ), ( Engine Size: 5.3 L ), ( Fuel Type: Gasoline ), ( Type: Complete Assembly ), ( Oe/oem Part Number: 12668643 ), ( Country Of Origin: United States ), ( Id: 62b6d7e1-94e5-4ea8-937f-a04c4fc5c165 ), ( Interchange: 300-5653 ), ( Year: 17 ), ( Partout Id: A-123309391 )

Review GM TRUCKS Gmc 5.3l V-8 Engine Complete Assembly Oem fits SIERRA 1500 2016–2018

The GM 12660312 engine is a powerful V-8 unit manufactured by General Motors for select 2016-2018 GMC Sierra 1500 models. This engine is part of the EcoTec3 family, which is known for its advanced technology and impressive performance.

The engine has a displacement of 5.3 liters and features an aluminum block and cylinder heads. This design not only reduces the overall weight of the engine but also improves its thermal efficiency. It is equipped with direct fuel injection technology, which enhances combustion efficiency and contributes to better fuel economy.

The engine comes with a variable valve timing system, which optimizes the intake and exhaust valve timing based on engine load and driving conditions. This results in improved power and torque across the entire RPM range. The engine also features Active Fuel Management (AFM) technology, which allows it to operate on four cylinders during light-load driving conditions to save fuel.

The GM 12660312 engine produces an impressive 355 horsepower at 5,600 RPM and 383 lb-ft of torque at 4,100 RPM. It is mated to a six-speed automatic transmission, which delivers smooth and responsive gear changes.

The engine is designed to meet stringent emission standards, thanks to its advanced technologies such as exhaust gas recirculation, cooled exhaust gas recirculation, and a three-way catalytic converter. It also features a closed-loop fuel system, which continuously monitors and adjusts the fuel mixture to optimize engine performance and efficiency.

The GM 12660312 engine is built with durability in mind. It features a cast-iron crankshaft, forged connecting rods, and forged pistons. The engine also comes with a heavy-duty cooling system, which includes a large radiator, a thick front core, and a transmission cooler to keep the engine running cool under heavy loads.

In summary, the GM 12660312 engine is a powerful and advanced V-8 unit that delivers impressive performance and fuel economy. It is designed with the latest technologies, including direct fuel injection, variable valve timing, and Active Fuel Management, to optimize power, torque, and efficiency. The engine is built to meet stringent emission standards and is engineered for durability and longevity.

The GMC Sierra 1500 5.3L V-8 engine, specifically model number 12660312, produced between 2016 and 2018, is a popular choice for those seeking power and reliability in their full-size pickup trucks. Before making a decision to buy this engine, it's essential to consider its advantages and disadvantages.

1. Powerful and Efficient: The 5.3L V-8 engine delivers an impressive amount of power, with up to 355 horsepower and 383 lb-ft of torque. At the same time, it offers decent fuel efficiency for its class.

2. Durable and Dependable: This engine is known for its robustness and reliability. It has a sturdy design, which makes it suitable for heavy-duty tasks and towing.

3. Flexible: The 5.3L V-8 engine is available with various transmission options, including a six-speed automatic and an eight-speed automatic, catering to different driving preferences and needs.

1. High Emissions: This engine generates relatively high emissions, which may not meet the latest emission standards in some areas.

2. Thirsty: Compared to some modern engines, the 5.3L V-8 can be thirsty, especially when towing heavy loads or driving at high speeds.

3. Loud: The engine can be quite loud during acceleration, which may not appeal to those seeking a quieter driving experience.

The GMC Sierra 1500 5.3L V-8 engine, model number 12660312, offers a powerful and efficient performance, making it an excellent choice for those who require heavy-duty capabilities from their pickup truck. However, it comes with some drawbacks, including high emissions, thirsty fuel consumption, and a loud operating noise.

If you prioritize power and reliability in your full-size pickup truck and are not overly concerned about fuel efficiency, emissions, or noise, the GMC Sierra 1500 5.3L V-8 engine could be an excellent fit for your needs. However, if you're looking for a more fuel-efficient, quieter, or emissions-friendly engine, you may want to consider alternative options.

Details:

COD available for qualified orders placed local delivery. Vehicle Stock #: A278. Mileage condition: 62487. Part Stock #.

Model: GMC SIERRA 1500.

part #: 12660312 prices

• $609.29-$3999.99

specifications grokengines:

• for models: 1500, Sierra
• for makes: Gmc
• for years: 2016-2018
• brand: Gm Trucks
• mpn: 12660312
• engine size: 5.3 L
• fuel type: Gasoline
• type: Complete Assembly
• oe/oem part number: 12668643
• country of origin: United States
• id: 62b6d7e1-94e5-4ea8-937f-a04c4fc5c165
• interchange: 300-5653
• year: 17
• partout id: A-123309391

shipping grokengines:

• type: Fixed
• cost: $300.00
• class: Freight
• service: Flat Rate Freight

seller grokengines:

• # reviews: 10676
• city: Maple height, Ohio
• rating: 99.2%

payments grokengines:

• cash
• credit card: Visa
• wallet: Google-pay
• other
• money order

returns grokengines:

• policy: Returns Accepted
• time: 60 Days
• paid by: Buyer

general grokengines:

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

offer grokengines:

• quantity: 1
• best offers: True
• started: April 16, 2026
• options: Ship-to-home
• sold: 0
• availability: In Stock

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