* Engine size: The 1GZ-FE is a massive 5.0L V12 engine, while the SC400 was designed for a 4.0L V8 (1UZ-FE). The 1GZ is simply too large and heavy to fit in the SC400's engine bay without extensive modifications.
* Transmission compatibility: The 1GZ-FE was paired with a specific transmission that may not be compatible with the SC400's drivetrain.
* Electronics: The 1GZ-FE uses different engine management systems and electronics that may not be compatible with the SC400's wiring harness and ECU.
Possible Challenges:
* Engine bay space: You'd need to significantly modify the SC400's engine bay to accommodate the larger engine, potentially including cutting and welding.
* Cooling system: The 1GZ-FE's cooling system might be too large for the SC400's radiator and cooling system components.
* Exhaust system: You'd need a custom exhaust system to fit the 1GZ-FE's headers and exhaust manifold.
* Transmission and driveline: Adapting the 1GZ-FE's transmission and driveline to the SC400's chassis would be incredibly difficult.
* Electronics and wiring: Integrating the 1GZ-FE's engine management system and wiring with the SC400's electronics would require extensive rewiring and potentially a custom ECU.
While it's not impossible to swap in a 1GZ-FE, it's a massive undertaking that requires a significant amount of engineering expertise, fabrication skills, and custom parts. It's much more practical to stick with a V8 engine swap, like a 2JZ-GTE, which is more common and has better compatibility with the SC400.
In conclusion, it's highly discouraged to attempt a 1GZ-FE swap into an SC400 due to the immense challenges involved. It's a project that's better left to professional engine swap specialists.
