.045 in is a safe bet, although you can probably find it on the emissions sticker under the hood.
the spark plugs are located in the front of the engine and rear, just follow the spark plug wires and you will find the spark plugs
the gapping is .060
.060
2003 1500 Series 2wd Chevrolet Sylverado 5.3L Engine. Spark plug gap for this engine is .040.
.60
60
.60
On the inline six cylinder engine , spark plug # 6 is the rear spark plug On the V6 engine , spark plug # 6 is the rear plug on the drivers side of the engine On the V8 engines , spark plug # 6 is the 2nd plug from the front on the drivers side of the engine
.060 thousands
AC R44LTS6 0.06 gap
0.060 inch (1.52mm)
.065