Relatively Straightforward (with caveats):
* Other Nissan/Infiniti V6s: This is the easiest route. VG30E, VG30DE, VG30DETT (from other Z31s, 300ZX models, or other Nissan/Infiniti vehicles) are all relatively plug-and-play options, though wiring harnesses and ECU tuning might require some work depending on the specific donor engine and year. The VG30DETT (turbo) is the most popular choice in this category, but it requires significant upgrades to the supporting systems (fuel, cooling, etc.) to be reliable.
* RB26DETT (from Skyline GT-R): While technically more complex than other Nissan V6 swaps, the RB26DETT is a very popular choice for its power and legendary status. However, it requires custom fabrication for engine mounts, a considerable amount of wiring and ECU tuning, and substantial upgrades to the drivetrain (transmission, axles, etc.) to handle the extra power and torque. It's a significant undertaking.
More Complex Swaps:
* LS-series GM V8s (LS1, LS2, LS3, etc.): These are increasingly popular due to their abundance, relative affordability, and impressive power output. However, they require extensive custom fabrication for engine mounts, exhaust, wiring, and potentially even the transmission tunnel. These swaps are not for the faint of heart or those with limited fabrication skills.
* Other V8s (e.g., Ford Coyote, small block Chevy): Similar to the LS-series swaps, these require significant custom work and are generally more challenging than the Nissan V6 options.
* SR20DET (from Nissan 200SX/Silvia): This inline-four engine swap is appealing due to its relatively compact size and performance potential, but also requires considerable custom work, especially for making it fit well.
Things to Consider for ANY Swap:
* Cost: The cost varies dramatically based on the engine choice, whether you're using new or used parts, and the level of professional help you require.
* Fabrication Skills: Many swaps will require significant welding, cutting, and other fabrication skills.
* Wiring and ECU Tuning: This is critical for any engine swap, and often necessitates specialized knowledge and equipment.
* Drivetrain Compatibility: Ensure the transmission and differential can handle the power and torque of the new engine.
* Legal Considerations: Check your local regulations regarding engine swaps and emissions compliance.
In summary, while the VG30DETT swap remains the most common and arguably easiest high-performance upgrade, the possibilities are vast. Choosing the right engine swap depends heavily on your mechanical skills, budget, and desired performance goals. Thorough research and planning are absolutely crucial before beginning any engine swap project.
