How to determine engine size
It's most likely a 5.3. There should be a little sticker under the hood somewhere that has some small writing on it. One of the first things on it is the engine size.
The emissions sticker under the hood will tell you.
The eighth character of your vehicle identification number (VIN) will tell you as well. HTH. -Jim
Looking for a Used Sierra 1500 in your area?
CarGurus has 9,152 nationwide Sierra 1500 listings starting at $3,999.
Search GMC Sierra 1500 Questions
GMC Sierra 1500 Experts
Related Models For Sale
Used Cars for Sale