Vortec 5.3L V8 SFI and Automatic. What are you waiting for?! Isn't it time for a GMC?! Looking for an amazing value on a wonderful 2008 GMC Sierra 1500? Well, this is IT! Designated by Consumer Guide as a 2008 Recommended Large Pickup. This spirited machine can turn the everyday driver into a gearhead as they experience a whole new kind of acceleration and exceptionally potent power.