Cylinder #s Drivers side head front to rear is 1-3-5-7
The other head front to rear is 2-4-6-8
If it's a V6 then it is in the right head by the back spark plug. ............V8..................................................... Front spark plug. This is you standing in the front of engine.
The spark plug gap for a 1991 Chevy Silverado 2500 V8-350 is .035, according to major spark plug manufacturers (i.e. Autolite, Bosch, Denso, NGK).
The 1998 Chevrolet Silverado V-8 engine spark plug gap is .031. Most spark plugs come pre-gapped from the spark plug manufacturer.
0.040 inch.
A 2009 Chevrolet Silverado with the 5.3 engine requires a .040" spark plug gap.
spark plug gap is .045 unless specified different by spark plug manufaturer.
2004 Chevrolet Truck Silverado 1500 2WD 5.3L SFI 8cylThe Spark Plug Gap.040 (In thousandths of an inch)
0.060
It is on the driver side head, V6 engines back by the back spark plug.#5 V8 engines up in the front by the #1 spark plug
.040
Listed in your owner's manual and under the hood on a placard. 0.060 inches.
Right next to the #1 spark plug on the bank 1 head, closest to radiator on drivers side