* Your vehicle's paperwork: The title or original window sticker will specify the engine.
* The engine bay: The engine size is usually stamped on a plate on the engine block itself.
* Your vehicle's identification number (VIN): A dealer or online VIN decoder can use the VIN to tell you the engine size and other specifications.
Common engine sizes for the 1998 GMC Sierra 1500 include:
* 4.3L V6: A relatively common option.
* 5.0L V8: Also a fairly common choice.
* 5.7L V8: A larger, more powerful option.
Without knowing your specific truck's VIN or checking the engine bay/paperwork, it's impossible to say for certain which engine size yours has.
