2009 Chevy Impala SS ( 5.3L LS4 V8 )
Shes fast. The LS4 is a 5,328 cc (5.328 L; 325.1 cu in) version of the
Generation IV block. Though it has the same displacement as the Vortec 5300
LY5, it features an aluminum block instead of iron, and it uses the same
cylinder head as the Generation III LS6 engine. The bellhousing bolt
pattern differs from the rear-wheel drive blocks.
This engine is adapted for transverse front-wheel driving applications.
According to GM, "The crankshaft is shortened 13 mm – 3 mm at the
flywheel end and 10 mm at the accessory drive end – to reduce the length
of the engine compared to the 6.0L. All accessories are driven by a single
serpentine belt to save space. The water pump is mounted remotely with an
elongated pump manifold that connects it to the coolant passages. Revised
oil pan baffles, or windage trays, are incorporated into the LS4 to ensure
that the oil sump stays loaded during high-g cornering. Active Fuel
Management is also used. Output of this version is 303 hp , 300 hp on
LaCrosse Super and 323 lb·ft of torque
The most notable news about the model, though, is the SS model's use of the
Generation IV small-block V8 in a front-wheel-drive Chevrolet for the first
time, and the first V8 in a Chevrolet sedan since the 1996 Caprice: the new
5.3 liter (325 cu in) V8 (with Displacement on Demand, now called Active
Fuel Management or AFM) produces 303 horsepower (226 kW). With
the use of the 5.3 liter LS4 V8, the Impala SS is capable of a 5.6 second
0–60-mile-per-hour (0–97 km/h) time and a quarter-mile time of 14.2
seconds traveling at 101 miles per hour (163 km/h). The car is 200.4 inches
(5,090 mm) long, 58.7 inches (1,491 mm) high, and 72.9 inches (1,850 mm)
The LS was the base model. It offered steel wheels with wheel covers (later
alloy wheels), an AM/FM stereo with single-disc CD player, auxiliary input
jack, and six speakers, keyless entry, air conditioning, cloth seating
surfaces, and your choice of two front bucket or a single front bench seat.
The LT was the mid-range model. It offered alloy wheels, MP3 playback
capabilities, and optional front heated seats.
The LTZ was the most luxurious model. It offered leather seating surfaces
that were heated, an AM/FM stereo with six-disc CD/MP3 changer in the dash
and a Bose eight-speaker premium sound system, a power sunroof, security
system, and OnStar.
The SS was the top-of-the-line model until 2009. It offered a 5.3L V8
engine, leather-and-suede seating surfaces, eighteen-inch machined-finished
alloy wheels, and unique SS badging. Due to its unpopularity, the SS trim
was discontinued in 2009, leaving the LTZ as the top-of-the-line model for
In 2007, the Impala received the FlexFuel 3.5-liter V-6 and Flex Fuel rear
badge for the LS, LT, LTZ, & Touring. A new 3.9-liter V-6 with Active Fuel
Management was available. The SS retained the same drivetrain and did not
receive the FlexFuel feature due to the high-performance nature of the
powertrain. A tire-pressure-monitoring system, cruise control and a CD
player were standard on all models, and a factory spoiler was an available
option. The LT had 16-inch, five-spoke alloy wheels. The generation-7
OnStar system with turn-by-turn navigation was included when the available
directions and connections service was selected. The SS had standard
leather-appointed seats and XM Satellite Radio, with XM being optional on
LS, LT, and LTZ trims. A new Luxury Edition package featuring leather
seating, folding rear seat, and rear spoiler was offered on the LT. There
were four new exterior colors—Precisions Red, Imperial Blue Metallic,
Bordeaux Red, and Red Jewel Tintcoat, as well as a Regency-outfitted
"Impala RSS". The RSS included aggressive wheels, front/rear bumper and
rocker panel extensions, a spoiler and various interior upgrades.
The Touring trim level was discontinued for 2009. Leather seating was no
longer available in combination with the 40/20/40 split bench front seat.
The Active Fuel Management feature remained on the 5.3L V8 with a 17 gallon
gas tank for the SS model, but was no longer available on 3.9L V6 for the
LT and LTZ models. A sun and wheel package was available on 1LT models
included power sunroof, overhead console with Homelink and 17-inch aluminum
wheels. A Bose Premium Audio System was now part of the Luxury Edition
package offered on LT models. Thorax side-impact air bags were standard.