* 5.7L Vortec V8: This was a popular choice.
* 7.4L V8: A larger, more powerful engine option.
* 6.5L Turbo Diesel: A diesel option was available, offering better fuel economy but lower horsepower than the gas engines.
To know for sure which engine is in *your* specific 1994 GMC K1500, you need to check:
* The vehicle's title or registration: This may list the engine displacement.
* The VIN (Vehicle Identification Number): A dealer or online decoder can use the VIN to determine the exact specifications of the truck, including the engine.
* The engine itself: The engine's displacement is usually stamped on a visible part of the engine block.
Looking at the engine bay should also give you a visual clue; the size and shape of the engine will be different for each option.