Spark Plug Specifications
WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
SPARK PLUG SPECIFICATIONS
| Application | Specification | |
|---|---|---|
| Spark Plug Type | ||
| 4.3L | AC R41-932 | |
| 4.8L, 5.3L & 6.0L | AC 25171803 | |
| 8.1L | Denso TJ14R-P15 | |
| Gap | Iridium .040 in. (1.04 mm) Platinum .060 in. (1.52 mm) |
|
| Tightening Torque | Tighten to 15 ft. lbs. (20 N.m) when using NEW cylinder head. Tighten to 11 ft. lbs. (15 N.m) for all subsequent installations. | |
| Firing Order | ||
| 4.3L | 1-6-5-4-3-2 | |
| 4.8L, 5.3L, 6.0L & 8.1L | 1-8-7-2-6-5-4-3 | |
| 6.6L | 1-2-7-8-4-5-6-3 | |