* 2.0L L4 (Iron Duke): This was the most common engine.
* 2.5L L4 (technically a Buick-designed engine, but used in many GM vehicles): Less common, but still a possibility for a 1990 Sunbird.
* 2.8L V6: A more powerful option, but less common than the four-cylinder engines.
Swapping Engines:
Swapping engines is possible, but it's a significant undertaking. The feasibility depends on your mechanical skills and budget. Engines from other GM vehicles of the same era (late 80s/early 90s) are generally the easiest to swap because many components (transmission, mounts, wiring harnesses) will be more compatible. You'd need to consider factors like:
* Engine mounts: These will need to be compatible or fabricated.
* Transmission: Your existing transmission may or may not work with a different engine.
* Wiring harness: You may need to modify or replace the wiring harness to accommodate the new engine.
* Computer (PCM/ECM): The engine control module needs to be compatible.
* Exhaust system: Likely needs modification or replacement.
Without a deeper dive into your specific goals and mechanical skills, it's difficult to give a more precise list of compatible engines. However, researching engines from other GM vehicles (Chevrolets, Oldsmobiles, Buicks, etc.) from the same era would be a good starting point for a potential swap. Remember to check for compatibility of the transmission as well.
