GMC 2006 Sierra - Manual (Page 547)

Engine Specifications
Engine VIN Code Transmission Spark Plug Gap
VORTEC™ 4.3L V6 X
Automatic
Manual
0.060 inches (1.52 mm)
VORTEC™ 4.8L V8
V
Automatic
Manual
0.040 inches (1.01 mm)
VORTEC™ 5.3L V8 Z Automatic 0.040 inches (1.01 mm)
VORTEC™ 5.3L V8 T Automatic 0.040 inches (1.01 mm)
VORTEC™ 6.0 V8 U
Automatic
Manual
0.040 inches (1.01 mm)
VORTEC™ 6.0L V8 N
Automatic
Manual
0.040 inches (1.01 mm)
VORTEC™ 8.1L V8 G
Automatic
Manual
0.060 inches (1.52 mm)
5-135