fits year: 2001–2007.

( Brand: Gm ), ( Manufacturer Part Number: 3666UE ), ( Part Type: Engine Motor ), ( Warranty: 3 Year ), ( Core Charge: 600 ), ( Country Region Of Manufacture: United States )
The GM 3666UE 6.0L V8 engine, specifically the LQ4 and LS variants, is a powerhouse of an automotive component, primarily used in various vehicles from 2001 to 2007. This engine is a testament to General Motors' engineering prowess, delivering an impressive combination of power, reliability, and efficiency.
The 6.0L V8 engine features a displacement of 6.0 liters, which is a substantial capacity that translates into robust power output. The LQ4 version of this engine is known for its durability and longevity, making it a popular choice for many truck and SUV enthusiasts. The LS version, on the other hand, offers a more modern design and improved performance, featuring advanced technologies such as variable valve timing and direct fuel injection, resulting in better fuel efficiency and reduced emissions.
The engine's V8 configuration, consisting of eight cylinders arranged in a 'W' shape, allows for a smooth and powerful performance. The engine block is cast-iron, ensuring durability and resistance to heat, while the aluminum cylinder heads further contribute to the engine's lightweight yet sturdy construction.
The GM 3666UE 6.0L V8 engine is mated to a 4L80E or 4L60E automatic transmission in most applications, providing smooth and effortless gear changes. It can produce up to 300 horsepower and 360 lb-ft of torque, making it a powerful and capable engine for towing and hauling.
In summary, the GM 3666UE 6.0L V8 engine is a powerful and reliable workhorse, suitable for vehicles requiring high torque and towing capabilities. Its versatility, durability, and performance make it a popular choice among car enthusiasts and professionals alike.
Pros of buying a GM 3666UE 6.0L V8 LQ4/LS engine from 2001-2007:1. Reliability: These engines are known for their durability and longevity. They have been used in a variety of GM vehicles and have proven to be reliable over time.
2. Power: With a 6.0L V8 engine, you're getting a lot of power. This engine is capable of producing up to 345 horsepower, making it a great choice for those looking for a powerful engine.
3. Availability: These engines are widely available on the secondary market, which means you should have no trouble finding one for sale.
4. Versatility: The LQ4/LS engine is used in a variety of GM vehicles, including trucks and SUVs, which means you have a lot of options when it comes to finding a vehicle with this engine.
Cons of buying a GM 3666UE 6.0L V8 LQ4/LS engine from 2001-2007:1. Fuel Consumption: The engine's power comes at a cost, and that cost is fuel consumption. These engines are not known for their fuel efficiency, so if you're looking for a vehicle that gets great gas mileage, this may not be the best option for you.
2. Maintenance Costs: While the engine is reliable, it does require regular maintenance to keep it running at its best. This can add up over time, especially if you're not comfortable doing the maintenance yourself.
3. Emissions: These engines are not known for their emissions performance. They produce a lot of pollutants, which can be a concern for those looking for an eco-friendly option.
Conclusion: If you're looking for a powerful, reliable engine that's widely available and versatile, the GM 3666UE 6.0L V8 LQ4/LS engine from 2001-2007 is a solid choice. However, you should be aware of the potential downsides, such as fuel consumption, maintenance costs, and emissions. If you're willing to accept those trade-offs, this engine could be a great fit for your needs.
Recommendation: If you're in the market for a used engine, I would recommend doing your research and comparing prices from various sources to ensure you're getting a fair deal. Additionally, make sure to have the engine inspected by a qualified mechanic before making a purchase to ensure it's in good working condition.
P/U Available. All parts are visually inspected as well. Inspection Menfolks testing uses magnetic particles to inspect metal, checking for microscopic cracks and fissures that will cause long-term failure.
Residential and/or Lift gate fees are more. Machining and New Parts Deck surfaces are CNC machined new parts added. New parts include bearings, pistons, rings, lifters, oil pump, gaskets, Vito valve seals, freeze plugs, galley plugs and either a new timing chain gears.
SIM Testing Each engine is tested after reassembly, with the cooling and oil systems being fully pressurized crank spun at high RPM to verify compression build quality. Remaining gaskets as well are included. The engine has new oil pump is installed along with head bolts.