GMC 2010 Sierra - Manual (Page 599)

Engine Specifications
Engine VIN Code Transmission Spark Plug Gap
4.3L V6 (LU3) X Automatic 0.060 in (1.52 mm)
4.8L V8 (L20) A Automatic 0.040 in (1.02 mm)
5.3L V8 Flexible Fuel with Active
Fuel Management™ (Iron
Block) (LMG)
0 Automatic 0.040 in (1.02 mm)
5.3L V8 Flexible Fuel with Active
Fuel Management™(Aluminum
Block) (LC9)
3 Automatic 0.040 in (1.02 mm)
6.0L V8 (Iron Block) (L96 or LY6) G or K Automatic 0.040 in (1.02 mm)
6.2L V8 Flexible Fuel (Aluminum
Block) (L9H)
2 Automatic 0.040 in (1.02 mm)
6-139