Vortec 5.3L V8 SPI and 4-Speed Automatic with Overdrive. Wow! What a sweetheart! Nice truck! If you've been thirsting for just the right 2000 GMC Sierra 1500, well stop your search right here. This is the ultimate truck that is sure to fit your needs. The precision-tuned Vortec 5.3L V8 SPI engine provides the very essence of performance, delivering substantial horsepower and torque. our dealership works with national and regional lenders for the best terms and rates available!