Toyota Century / Supra 1GZ-FE JDM Engine | 5.0L V12 DOHC Dual VVT-i Motor

Feature	Details
Engine Code	1GZ-FE
Displacement	5.0 Liters (4,996 cc)
Configuration	60° V12 DOHC 48-Valve
Valvetrain	Dual VVT-i (Variable Valve Timing with intelligence)
Horsepower	276–295 hp (Gentleman's Agreement restricted)
Torque	355 lb-ft @ 4,000 rpm
Redline	6,000 RPM
Transmission	4-Speed (1997-2004) or 6-Speed (2005+) Automatic

 

Vehicle Fitments & Swap Potential

This 1GZ-FE powertrain is the primary choice for:

• 1997-2017 Toyota Century (GZG50): Direct OEM replacement.

• Toyota Supra (A80/MK4) Swap: The legendary "Top Secret" style V12 conversion.

• Custom Restomods: A popular choice for high-end Toyota Land Cruiser (J80/J100) and Lexus LS conversions.

Technical Insight: The 1GZ-FE features two independent ECUs (one for each 6-cylinder bank), allowing the engine to run as an inline-6 in the event of a sensor failure—a testament to its "failure-is-not-an-option" design.

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Installation & Technical Notes

Due to the complexity of a 12-cylinder engine, please adhere to these technical guidelines:

• Dual ECU Management: For custom swaps (Supra/LS), we strongly recommend utilizing a standalone engine management system (e.g., Haltech, MaxxECU, or Motec) to simplify the wiring and unlock the true power potential, which can easily exceed 500+ HP with bolt-ons.

• Oil System: The 1GZ-FE utilizes a large oil capacity. Ensure the oil cooler lines are properly flushed and that high-quality 5W-30 or 0W-30 synthetic oil is used to maintain the VVT-i phasers.

• Physical Dimensions: Measuring approximately 32 inches long, this engine is a tight fit for most engine bays. Ensure your chassis can accommodate the length and the 60° bank angle.

• Essential Maintenance: We recommend replacing the following during the swap:

  • Spark Plugs: 12x NGK Iridium plugs (BKR6EIX-11).

  • Gaskets: Intake manifold gaskets and valve cover gaskets (highly recommended as they are difficult to access once installed).

  • Serpentine Belt: Replace the main drive belt and inspect the hydraulic fan pump (if equipped).

• Fuel Requirement: 91+ Octane Premium fuel is required to ensure the knock sensors do not pull timing on this high-displacement assembly.