The Chevrolet Impala IX 5.3 V8 SS, produced from 2006 to 2009, represented the performance pinnacle of the ninth-generation Impala. Positioned as the flagship trim, the SS (Super Sport) variant aimed to recapture some of the Impala’s historical muscle car image, offering a substantial increase in power and a more aggressive aesthetic compared to the base and LS models. This generation Impala, built on the GM W-body platform, was a significant departure from its predecessors, focusing on a more contemporary design and improved interior refinement. The 5.3L V8 SS was a relatively short-lived offering, discontinued alongside the W-body platform as Chevrolet shifted its focus to newer models.
Technical Specifications
| Brand | Chevrolet |
| Model | Impala |
| Generation | Impala IX |
| Type (Engine) | 5.3 V8 SS (307 Hp) |
| Start of production | 2006 |
| End of production | 2009 |
| Powertrain Architecture | Internal Combustion engine |
| Body type | Sedan |
| Seats | 5 |
| Doors | 4 |
| Fuel consumption (urban) | 13.1 l/100 km (18 US mpg, 21.6 UK mpg) |
| Fuel consumption (extra urban) | 8.7 l/100 km (27 US mpg, 32.5 UK mpg) |
| Fuel Type | Petrol (Gasoline) |
| Weight-to-power ratio | 5.6 kg/Hp, 179 Hp/tonne |
| Weight-to-torque ratio | 3.9 kg/Nm, 255.4 Nm/tonne |
| Power | 307 Hp @ 5600 rpm |
| Power per litre | 57.6 Hp/l |
| Torque | 438 Nm @ 4400 rpm (323.05 lb.-ft. @ 4400 rpm) |
| Engine layout | Front, Longitudinal |
| Engine Model/Code | LS4 |
| Engine displacement | 5327 cm3 (325.07 cu. in.) |
| Number of cylinders | 8 |
| Engine configuration | V-engine |
| Cylinder Bore | 96 mm (3.78 in.) |
| Piston Stroke | 92 mm (3.62 in.) |
| Compression ratio | 10:1 |
| Number of valves per cylinder | 2 |
| Fuel injection system | Multi-port manifold injection |
| Engine aspiration | Naturally aspirated engine |
| Engine oil capacity | 5.7 l (6.02 US qt | 5.02 UK qt) |
| Coolant | 12.6 l (13.31 US qt | 11.09 UK qt) |
| Kerb Weight | 1715 kg (3780.93 lbs.) |
| Trunk (boot) space – minimum | 527 l (18.61 cu. ft.) |
| Fuel tank capacity | 66 l (17.44 US gal | 14.52 UK gal) |
| Length | 5091 mm (200.43 in.) |
| Width | 1851 mm (72.87 in.) |
| Height | 1487 mm (58.54 in.) |
| Wheelbase | 2807 mm (110.51 in.) |
| Front track | 1586 mm (62.44 in.) |
| Rear (Back) track | 1562 mm (61.5 in.) |
| Drivetrain Architecture | The Internal combustion engine (ICE) drives the front wheels of the vehicle. |
| Drive wheel | Front wheel drive |
| Number of gears and type of gearbox | 4 gears, automatic transmission |
| Front suspension | Spring Strut |
| Rear suspension | Coil spring |
| Front brakes | Ventilated discs |
| Rear brakes | Disc |
| Assisting systems | ABS (Anti-lock braking system) |
| Steering type | Steering rack and pinion |
| Tires size | 235/50 R18 |
Powertrain & Engine Architecture
The heart of the Impala SS was the LS4 5.3-liter V8 engine. This engine, a member of General Motors’ Small-Block V8 family, featured an aluminum cylinder head and block construction, contributing to a relatively lightweight design for its displacement. The LS4 utilized a 96mm bore and 92mm stroke, resulting in a displacement of 5327 cubic centimeters (325.07 cubic inches). Fuel delivery was managed by a multi-port fuel injection system, and the engine boasted a compression ratio of 10:1. The engine produced 307 horsepower at 5600 rpm and 323 lb-ft of torque at 4400 rpm. The engine was paired exclusively with a four-speed automatic transmission (4L60E), chosen for its balance of durability and smooth operation. While not a performance-oriented transmission like some found in Corvettes or Camaros, it was well-suited to the Impala’s grand touring character.
Driving Characteristics
The 5.3L V8 and four-speed automatic combination delivered a noticeable improvement in acceleration compared to the base Impala’s 3.8L V6. While not a sports car, the SS offered brisk performance, capable of 0-60 mph times in the low-to-mid 6-second range. The automatic transmission, while smooth, wasn’t particularly quick to downshift, and the gear ratios were geared more towards cruising comfort than outright acceleration. Compared to a manual transmission equipped Impala (which wasn’t offered with the 5.3L), the automatic traded some responsiveness for ease of use. The front-wheel-drive layout, while common for its class, limited the amount of power that could be effectively put to the ground, especially during hard acceleration.
Equipment & Trim Levels
The Impala SS came standard with a comprehensive list of features. Interior appointments included leather upholstery, power-adjustable front seats, and a premium audio system. Exterior styling cues included a unique front fascia with integrated fog lights, a rear spoiler, and 18-inch alloy wheels. Standard safety features included ABS, traction control, and dual front airbags. Optional extras included a sunroof, upgraded sound system, and remote start. The SS trim was positioned as the top-of-the-line Impala, offering a more luxurious and sporty experience than the base and LS models.
Chassis & Braking
The Impala SS utilized a standard W-body chassis with independent front suspension and a multi-link rear suspension. The suspension was tuned for a balance of ride comfort and handling. The SS featured slightly stiffer springs and dampers compared to lower trims, providing a more controlled driving experience. Braking duties were handled by ventilated disc brakes at all four corners, providing adequate stopping power for the vehicle’s weight and performance. ABS was standard, enhancing braking performance in emergency situations.
Market Reception & Comparison
The Impala SS was generally well-received by automotive critics, who praised its powerful engine, comfortable ride, and spacious interior. However, some critics noted the front-wheel-drive layout as a limitation, and the four-speed automatic transmission was considered somewhat dated compared to newer transmissions with more gears. Fuel economy was reasonable for a V8-powered sedan, averaging around 18 mpg in the city and 27 mpg on the highway. Compared to other V8-powered sedans of the time, such as the Dodge Charger and Ford Crown Victoria, the Impala SS offered a more refined interior and a more modern design.
Legacy
The Chevrolet Impala IX 5.3 V8 SS represents a final attempt to inject some performance and excitement into the Impala nameplate before the model was discontinued. While not a high-volume seller, the SS has gained a following among enthusiasts who appreciate its combination of power, comfort, and affordability. The LS4 engine, while not known for being particularly high-strung, is generally considered reliable, and parts availability remains good. Today, well-maintained Impala SS models are becoming increasingly collectible, offering a unique and affordable entry point into the world of American V8 performance.
