Common engine sizes for a 2004 Chevy truck include:
* 4.3L V6: A smaller, fuel-efficient option.
* 4.8L V8: A more powerful V8.
* 5.3L V8: Another popular V8 option, often found in higher trim levels.
* 6.0L V8: A larger displacement V8, typically in heavier-duty models.
* 8.1L V8: A very large V8, usually found in heavy-duty trucks and SUVs.
Check the vehicle's paperwork, the engine bay (the engine size is often stamped on the engine itself), or use the VIN to look up the specifications online.