There's no single horsepower rating for a V8 FFV 5.3L engine. The horsepower output varies depending on the year of manufacture, the specific vehicle it's installed in, and even the exact calibration of the engine control module (ECM). Different manufacturers (like GM, which commonly uses this engine size) may also tune it differently.
You'll need to specify the *make, model, and year* of the vehicle to get a precise horsepower figure. Even then, it's best to consult the vehicle's owner's manual or a reliable automotive resource for the most accurate information.
