GMC 2007 Sierra Owner's Manual page 618

Engine
4.3L V6
4.8L V8
5.3L V8 Iron, Flexible Fuel
with Active Fuel
Management™, SFI, OHV
5.3L V8 Aluminum, Flexible
Fuel with Active Fuel
Management™, SFI
5.3L V8 Aluminum with Active
Fuel Management™
5.3L V8 Iron with Active Fuel
Management™
6.0L V8
6.0L V8 with Active Fuel
Management™
618
Engine Specifications
VIN Code
X
C
0
3
M
J
K
Y
Transmission
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Automatic
Spark Plug Gap
0.060 in (1.52 mm)
0.040 in (1.01 mm)
0.040 in (1.01 mm)
0.040 in (1.01 mm)
0.040 in (1.01 mm)
0.040 in (1.01 mm)
0.040 in (1.01 mm)
0.040 in (1.01 mm)