Chevrolet 2014 Express Owner's Manual page 366

12-4 Technical Data
Engine
4.3L V6
4.8L V8
5.3L V8
6.0L V8
6.0L V8 CNG/LPG
Engine Specifications
VIN Code
X
A
4
G
B
Transmission
Automatic
Automatic
Automatic
Automatic
Automatic
Spark Plug Gap
1.13 1.50 mm (0.053
0.059 in)
0.95 1.10 mm (0.037
0.043 in)
0.95 1.10 mm (0.037
0.043 in)
0.95 1.10 mm (0.037
0.043 in)
0.95 1.10 mm (0.037
0.043 in)