* 4.3L Vortec 4300 V6: This was a smaller engine option.
* 4.8L Vortec 4800 V8: A common and popular choice.
* 5.3L Vortec 5300 V8: Another frequently found V8, often with variable valve timing (VVT).
* 6.0L Vortec 6000 V8: This was the largest engine option, usually found in higher trim levels or with specific packages.
So there's no single answer; the engine size depends on the specific trim level and options of the 2006 Silverado 1500. You'd need to check the vehicle's documentation (like the owner's manual or the sticker on the driver's side doorjamb) to determine the exact engine size.
