2004 Chevrolet Impala - Specs

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Dimensions and capacities are in inches unless otherwise specified.

Powertrain / Chassis	3400 3.4L V-6 (LA1)	3800 3.8L Series II V-6 (L36)	3800 3.8L Supercharged Series II V-6 (L67)
Application	sedan	opt on sedan std on LS	SS
Type	3.4L V-6	3.8L V-6	3.8L Supercharged V-6
Displacement (cu in / cc)	207 / 3350	231 / 3791	231 / 3791
Bore & stroke (in / mm)	3.62 x 3.31 / 92 x 84	3.80 x 3.40 / 96.5 x 86.4	3.80 x 3.40 / 96.5 x 86.4
Block material	cast iron	cast iron	cast iron
Cylinder head material	cast aluminum	cast iron	cast iron
Valvetrain	OHV, 2 valves per cylinder	OHV, 2 valves per cylinder	OHV, 2 valves per cylinder
Ignition system	direct	direct	direct
Fuel delivery	sequential fuel injection	sequential fuel injection	sequential fuel injection
Compression ratio	9.5:1	9.4:1	8.5:1
Horsepower (hp / kw @ rpm)	180 / 134 @ 5200	200 / 149 @ 5200	240 / 179 @ 5200
Torque (lb-ft / Nm @ rpm)	205 / 278 @ 4000	225 / 305 @ 4000	280 / 380 @ 3600
Recommended fuel	87 octane	87 octane	92 octane required
Maximum engine speed (rpm)	6000	6000	6000
Emissions controls	evaporative system with catalytic converter/ EGR/PCV	evaporative system with catalytic converter/ EGR/PCV	evaporative system with catalytic converter/ EGR/PCV
Estimated fuel economy (mpg city / hwy / combined)	21 / 32 / 27	20 / 30 / 26	TBD

Transmission	2004 Chevrolet Impala
Type	Hydra-Matic 4T65-E, 4-speed automatic, front-wheel drive
Gear Ratios (:1)
1st	2.92
2nd	1.57
3rd	1.00
4th	0.71
5th	2.39
Final drive ratio	LA1: 2.86:1; L36: 3.05:1; L36 (police): 3.29:1; L67: 2.93:1

Chassis / Suspension	2004 Chevrolet Impala
Front	independent MacPherson struts, variable rate coil springs, hollow 32-mm stabilizer bar (SS has hollow 34-mm stabilizer bar)
Rear	independent MacPherson struts, non-linear coil springs, solid 14-mm stabilizer bar (SS has dual rate coil springs, hollow 19.5-mm stabilizer bar)
Steering type	power rack-and-pinion for all models
Steering ratio	3400 V-6: 15.2:1; 3800 V-6: 13.2:1
Steering wheel turns, lock-to-lock	3400 V-6: 2.74; 3800 V-6: 2.38; supercharged: 2.30
Turning diameter, curb-to-curb (ft / m)	3400 V-6, 3800 V-6: 38 / 11.6; supercharged: 39.6 / 12.1

Brakes	2004 Chevrolet Impala
Type	power-assisted 4-wheel disc, standard ABS for LS and SS
Rotor diameter x thickness (in / mm)	front: 11.93 x 1.26 / 303 x 32
	rear: 10.9 x .43 / 278 x 11

Wheels and Tires		2004 Chevrolet Impala
Wheel size and type	Sedan	Standard - 16-inch, steel wheel w/ wheel cover
		Optional - 16-inch custom aluminum wheel
	LS	Standard - 16-inch, 5-spoke aluminum wheel
	SS	Standard - 17-inch, diamond-cut aluminum
Tires	Sedan	Standard - P225/60R16 all-season blackwalls
		Optional - P225/60R16 touring
	LS	P225/60R16 touring
	SS	P235/55R17 W-rated

Exterior Dimensions		2004 Chevrolet Impala
Wheelbase (in / mm)		110.5 / 2807
Overall length (in / mm)		200 / 5080
Overall width (in / mm)		73 / 1854
Overall height (in / mm)		57.3 / 1456
Track (in / mm)	Front	62 / 1574
	Rear	61.1 / 1551
Curb weight (lb / kg)	Sedan	3606 / 1636
	LS	3476 / 1577
	SS	3606 / 1636

Interior Dimensions		2004 Chevrolet Impala
Seating capacity (front / rear)	Sedan	3 / 3
	LS	2 / 3
	SS	2 / 3
Head room (in / mm)	Front	39.2 / 996
	Rear	36.8 / 935
Leg room (in / mm)	Front	42.2 / 1072
	Rear	38.4 / 975
Shoulder room (in / mm)	Front	59 / 1499
	Rear	58.9 / 1496
Hip room (in / mm)	Front	56.5 / 1435
	Rear	55.7 / 1415

Capacities		2004 Chevrolet Impala
EPA interior volume (cu ft / L)		104.5 / 2959
EPA interior volume (cu ft / L)		123.1 / 3486
Cargo volume (cu ft / L)		18.6 / 526.7
Trailer towing maximum (lb / kg)		1000 / 454
Fuel tank (gal / L)		17 / 64.4
Engine oil (qt / L)	3400 V-6	4.5 / 4.3
	3800 V-6	4.3 / 4.1
Cooling system (qt / L)	3400 V-6	11.7 / 11.1
	3800 V-6	12.2 / 11.5