* 5.7L Vortec V8: This was the base engine, producing 255 horsepower and 325 lb-ft of torque.
* 6.5L Duramax Turbo-Diesel V8: This was the optional engine, producing 190 horsepower and 360 lb-ft of torque.
It's important to note that the 6.5L Duramax was discontinued in 2000, so it was only available for the 1999 model year.
