Chevrolet 2006 Silverado 1500 Pickup Owner's Manual page 536

Engine
VORTEC™ 4.3L V6
VORTEC™ 4.8L V8
VORTEC™ 5.3L V8
VORTEC™ 5.3L V8
VORTEC™ 6.0 V8
VORTEC™ 6.0L V8
VORTEC™ 8.1L V8
5-134
Engine Specifications
VIN Code
X
V
Z
T
U
N
G
Transmission
Automatic
Manual
Automatic
Manual
Automatic
Automatic
Automatic
Manual
Automatic
Manual
Automatic
Manual
Spark Plug Gap
0.060 inches (1.52 mm)
0.040 inches (1.01 mm)
0.040 inches (1.01 mm)
0.040 inches (1.01 mm)
0.040 inches (1.01 mm)
0.040 inches (1.01 mm)
0.060 inches (1.52 mm)