* Engine Bay Space: The engine bay is designed around the L67's dimensions. Larger engines might not fit without extensive bodywork.
* Mounting Points: The L67 has specific mounting points. An engine from a different car would require custom mounts, which is a major undertaking.
* Wiring Harness and ECU: The wiring harness and the engine control unit (ECU) are specific to the L67. You'd need a completely different harness and ECU for a different engine, along with potentially extensive rewiring.
* Transmission: The transmission (likely a 5-speed manual) needs to be compatible with the new engine. A swap might require a transmission change as well.
In short: While theoretically, *some* engines could be made to fit, it's an extremely complex and expensive project that's usually only undertaken by experienced mechanics or enthusiasts with extensive fabrication skills. Sticking with the original engine family (or a rebuilt/modified L67) is the most practical approach for most people. Consider carefully whether the potential costs and complexity are worth it compared to simply rebuilding or replacing the original engine.
