How much horsepower does a 2004 gs400 have?
Approximately 290 horsepower.
The 2004 Lexus GS 400 is powered by a 4.0-liter V8 (engine code 1UZ-FE) that delivered about 290 horsepower and roughly 300 lb-ft of torque for the U.S. market. This horsepower rating is SAE net power, the standard for American specifications at the time, reflecting performance suited to daily driving and highway merging in a mid-size luxury sedan.
Performance at a glance
Key specs at a glance include engine type, horsepower, torque, transmission, and drivetrain.
- Engine: 4.0-liter V8 (1UZ-FE)
- Horsepower: ~290 hp (SAE net, U.S. market, 2004)
- Torque: ~300 lb-ft
- Transmission: 5-speed automatic
- Drivetrain: Rear-wheel drive (RWD)
These core figures give a quick sense of the GS 400's performance envelope relative to its luxury-sedan peers from the same era.
Engine design and performance context
About the 1UZ-FE V8
The GS 400 uses Toyota/Lexus's 1UZ-FE 4.0-liter V8, a dual overhead cam, 32-valve design that emphasizes smooth power delivery and refined operation. In the 2004 model year, this setup produced roughly 290 horsepower and about 300 lb-ft of torque, figures that translated into confident highway acceleration and steady cruising performance typical of Lexus performance-oriented sedans of the period.
Notes on market variation
While the 2004 GS 400 specifications are generally consistent for the U.S. market, some international markets and later model-year updates can show minor calibration differences. The core figure—around 290 horsepower—remains the standard reference for the 2004 GS 400 in most consumer and enthusiast sources.
Summary
The 2004 Lexus GS 400 delivers roughly 290 horsepower from its 4.0-liter V8, paired with about 300 lb-ft of torque and a 5-speed automatic transmission. This combination offered a balance of refined luxury, smooth power delivery, and practical performance for daily driving in the early 2000s.
