* 5.7L Vortec V8 (small block): This is the most likely candidate for a direct swap, as it was a very common engine in those years.
* 7.4L Vortec V8 (big block): Also relatively straightforward, though it may require some minor adjustments depending on the specifics.
Swapping in engines from other years *might* be possible, but it significantly increases the complexity. You'll likely need to address:
* Wiring harnesses: Different year engines have different wiring. You might need to adapt or replace the harness.
* Engine mounts: These might need modification or replacement to fit the new engine.
* Transmission compatibility: The transmission needs to mate properly to the new engine. Some transmissions worked with multiple engine options, but you will need to ensure compatibility.
* Computer/ECM: The engine control module (ECM) will need to be compatible or reprogrammed.
For example, a later-model Vortec V8 *could* work, but the wiring and computer would require significant adaptation or replacement, making it a much more involved project.
Before attempting any engine swap, it's crucial to thoroughly research the compatibility of all components (including the transmission). Consult resources like online forums dedicated to Chevy Suburbans (e.g., forums on sites like Chevrolet Forum or dedicated truck forums). Talking to experienced mechanics specializing in classic GM vehicles is also highly recommended.
