* Direct replacements (easiest): The most compatible engines would be the same engines that originally came in the car. You'd need to check your specific vehicle's VIN to know for sure which one it had. The most common were variations of the 3.1L V6 and the 2.4L I4. Finding a used engine of the same type and year is the simplest swap.
* Other GM engines (more complex): Other GM engines *might* be physically compatible in terms of fitting the engine bay, but this requires significant research and likely modifications. You'd need to consider the following:
* Mounts: Engine mounts would almost certainly need to be fabricated or adapted.
* Wiring harness: You'd need a custom or modified wiring harness.
* Computer/ECU: The engine computer would need to be compatible or reprogrammed.
* Transmission: The transmission would need to be compatible with the new engine.
* Exhaust: The exhaust system would need to be adapted or replaced.
Essentially, while other GM engines *might* fit physically, the electrical and mechanical integration is extremely challenging and expensive without significant mechanical and electrical expertise. Sticking with the original engine type is strongly recommended for most people.
Before attempting any engine swap, consult a qualified mechanic. Engine swaps are complex projects and can be very time-consuming and costly if not done correctly.
