* Year of manufacture: Engine technology and design have evolved over time, leading to significant horsepower variations even within the same displacement.
* Specific model: Different vehicles using a 5.3L engine may have different tuning, resulting in varied horsepower and torque figures. A truck engine will likely have different horsepower than a car engine with the same displacement.
* Modifications: Aftermarket modifications (exhaust, intake, tuning, etc.) can dramatically increase or decrease horsepower.
To find the horsepower for a *specific* 5.3L engine, you need to know the exact year, make, and model of the vehicle it's in. Then you can look up the specifications in a vehicle owner's manual, a reliable automotive database (like Edmunds or Kelley Blue Book), or a repair manual.
