The 2003 Nissan 350Z is powered by a 3.5-liter V6 engine, the VQ35DE.
In the 2003 model year, the Z introduced Nissan's VQ35DE V6 to the lineup. It is a 3.5-liter, double-overhead-camshaft (DOHC) V6 with a 24-valve configuration, built with an aluminum block and heads. The engine features variable valve timing on the intake cam to improve smoothness and mid-range torque. It was paired with either a six-speed manual or a five-speed automatic transmission, with output varying slightly by drivetrain and market.
Engine specifications
Key specifications for the 2003 350Z's engine are listed below.
- Displacement: 3.5 L (3498 cc)
- Configuration: V6, DOHC, 24 valves
- Block/Head material: Aluminum
- Fuel system: Sequential multi-point fuel injection
- Variable valve timing: Yes, on the intake cam (VTC)
- Power (manual transmission): 287 hp at around 6,000 rpm
- Torque (manual transmission): ~274 lb-ft at around 4,400 rpm
These specifications define the core performance of the 2003 350Z’s powertrain and contributed to its characteristic balance of power and responsiveness.
Transmissions and output
Before listing the transmission options and their impact on output, note how the drivetrain choices affect performance figures.
- 6-speed manual: 287 hp and 274 lb-ft of torque
- 5-speed automatic: slightly lower output, commonly cited around the low-to-mid 270s hp and about 270 lb-ft of torque
In practice, the manual version is often cited for peak horsepower, while the automatic delivers a similar but slightly reduced torque curve, reflecting typical factory tuning for the era.
Summary
In short, the 2003 Nissan 350Z runs a 3.5-liter VQ35DE V6 with aluminum construction and variable valve timing on the intake cam, offering strong performance through either a six-speed manual or a five-speed automatic. The engine’s smooth power delivery helped establish the 350Z’s reputation for engaging driving dynamics in its early years.