What’s Involved in an FJ40 V8 Conversion?

The FJ40 V8 conversion is a popular modification for owners seeking more power, better highway performance, and improved towing capacity from their classic Toyota Land Cruiser. While the stock F or 2F engines are durable, swapping in a V8 can transform the driving experience. But this upgrade requires careful planning, proper components, and professional execution for the best results.

Choosing the Right V8 Engine

• Chevrolet small-block V8 – A common choice for its availability, power range, and aftermarket support.
• LS-series V8 – Modern fuel-injected options offering excellent reliability and efficiency.
• Ford V8 options – Less common but still viable, especially in custom builds.

Required Modifications

• Engine mounts – Custom or aftermarket mounts designed to fit the V8 into the FJ40’s engine bay.
• Transmission compatibility – Adapters or replacement transmissions may be needed to handle the extra power.
• Cooling system upgrades – A larger radiator and high-flow fans to keep engine temperatures in check.

Drivetrain & Suspension Upgrades

• Stronger axles – The increased power output may require reinforced axle components.
• Suspension tuning – Adjustments to handle the added weight and performance demands.
• Brake improvements – Upgraded brakes to ensure safe stopping with higher speeds and loads.

Electrical & Fuel System Changes

• Wiring harness – A custom or aftermarket harness to integrate the V8’s electrical systems.
• Fuel delivery – High-pressure fuel pump and upgraded lines for modern fuel-injected engines.
• Exhaust system – Custom headers and exhaust routing to fit the new setup.

Benefits & Considerations

• Significant power increase – Better acceleration, towing, and highway cruising capability.
• Potential fuel trade-offs – V8 swaps can increase fuel consumption compared to stock engines.
• Resale impact – Can boost appeal for performance-minded buyers but may reduce originality for purists.

The FJ40 V8 conversion can turn a classic Land Cruiser into a more versatile and powerful machine. Success depends on quality parts, experienced installation, and thoughtful upgrades to supporting systems to ensure both performance and reliability.