GMC Sierra Denali 2017 Owner's Manual page 456

4.3L V6 (LV1)
5.3L V8 (L83)
6.0L V8 (L96)
6.2L V8 (L86)
Engine Specifications (cont'd)
Engine
Technical Data
VIN Code Spark Plug Gap
P 0.95 1.10 mm (0.037
C 0.95 1.10 mm (0.037
G 0.95 1.10 mm (0.037
J 0.95 1.10 mm (0.037
455
0.043 in)
0.043 in)
0.043 in)
0.043 in)