| Engine |
Vortec
4800 4.8L V8 (LR4) |
Vortec
5300 5.3L V8 (L59) |
| Type |
4.8-liter
V8 |
5.3-liter
V8 |
| Displacement (cu in / cc) |
294 / 4807 |
327 / 5328 |
| Bore & stroke (in / mm) |
3.78
x 3.27 / 96 x 83 |
3.78
x 3.62 / 96 x 92 |
| Block material |
cast iron |
cast iron |
| Cylinder head material |
cast aluminum |
cast aluminum |
| Valvetrain |
overhead valves, 2 valves
per cylinder |
overhead valves, 2 valves
per cylinder |
| Ignition system |
coil near plug ignition,
platinum-tipped spark plugs, low-resistance spark
plug wires |
coil near plug ignition,
platinum-tipped spark plugs, low-resistance spark
plug wires |
| Fuel delivery |
sequential fuel injection |
sequential fuel injection |
| Compression ratio |
9.5:1 |
9.5:1 |
| Horsepower (hp / kw @ rpm) |
275 / 205 @ 5200 |
285 / 213 @ 5200 |
| Torque (lb-ft / Nm @ rpm) |
290 / 393 @ 4000 |
325 / 441 @ 4000 |
| Recommended fuel |
87 octane |
ethanol capable flex
fuel |
| Maximum engine speed (rpm) |
5900 |
5900 |
| Emissions controls |
three-way catalytic converter,
positive crankcase ventilation, evaporative collection
system |
three-way catalytic converter,
positive crankcase ventilation, evaporative collection
system |
Estimated fuel economy
(mpg city / hwy / combined) |
2WD: 15 / 19 / 17 |
2WD: 14 / 18 / 16 |
| 4WD:
14 / 17/ 15 |
4WD:
14 / 17 / 15 |