The 2007 Pontiac Grand Prix offered three engine choices, depending on the trim: a 3.8-liter V6 in base/GT form, a 3.8-liter supercharged V6 in the GTP, and a 5.3-liter V8 in the high-performance GXP.
In practice, this meant buyers could choose between a smooth, economical V6, a more potent supercharged variant for quicker acceleration, or a V8 option for top-end performance. The base and GT used the naturally aspirated 3.8L, the GTP added a Roots-type supercharger to the same 3.8L V6, and the GXP swapped in a GM 5.3L V8 borrowed from other GM vehicles to deliver higher horsepower and torque.
Engine options by trim
Below is a quick guide to the three configurations you could find on the 2007 Grand Prix, organized by trim level:
- 3.8-liter V6 (non-supercharged) – base/GT trim; part of GM’s 3800 Series II family; roughly around 200 horsepower with torque in the low-to-mid 200s (varies by year and tuning).
- 3.8-liter V6 with supercharger – GTP trim; uses a Roots-type supercharger on the same 3.8L V6; typically about 260–280 horsepower with torque around 260–280 lb-ft.
- 5.3-liter V8 – GXP trim; LS4-based V8 borrowed from GM’s Chevrolet lineup; approx. 303 horsepower and about 323 lb-ft of torque.
Power figures can vary by model year and individual vehicle, and transmissions or other options can affect performance. Always check the specific window sticker or VIN for exact specifications on a given car.
Details by engine type
3.8-liter V6 (non-supercharged)
The base 3.8L V6 belongs to GM’s 3800 family and provides a smooth, reliable daily-driver experience. It typically delivers around 200 hp with moderate torque, paired with a conventional automatic transmission.
3.8-liter V6 with supercharger
The GTP’s 3.8L V6 adds a Roots-type supercharger to boost output, turning the Grand Prix into a quicker model with stronger mid-range and overall acceleration. Expect roughly 260–280 hp and a similar increase in torque compared with the naturally aspirated version.
5.3-liter V8
Summary
The 2007 Pontiac Grand Prix could be equipped with three distinct engines: a 3.8-liter V6 in non-supercharged form, a 3.8-liter V6 with a supercharger for the GTP, and a 5.3-liter V8 in the GXP. Each engine aligned with a different performance emphasis—from everyday efficiency to sporty acceleration and high-end speed—making the model year’s lineup accessible to a range of buyers.