The 2004 Ford F150 was equipped with a 5.4L Triton V8 engine that produced up to 300 horsepower and 365 lb-ft of torque. The engine was known for its power and durability, making it a popular choice for those seeking a capable pickup truck engine. The engine had potential for upgrades as well, with aftermarket parts available to increase horsepower and performance. Popular modifications included adding a cold air intake, installing a performance exhaust system, and upgrading the engine's computer chip. With these modifications, the engine could produce up to 400-450 horsepower, significantly improving the truck's towing and hauling capabilities. Overall, the 5.4L engine in the 2004 Ford F150 offered a good balance of power, durability, and potential for upgrades.