BaySheet
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BaySheet
Opening the sheet…
2018 Chevrolet Silverado 1500
2018 Silverado 1500 spark plug gap is 0.037 to 0.043 in. on the 4.3L, 5.3L, and 6.2L. The table prints VIN codes and no plug part number.
Difficulty, time, and cost are estimates when this guide gives them. Torque is a cited figure, or it is left off.
Main source: 2018 Chevrolet Silverado Owner Manual, GMNA 11349200, CRC 2/27/18, engine specifications (opens in a new tab), General Motors, published 2018-02-27, read 2026-10-15.
Numbers on this page come from the cited source. Match the engine before you use a capacity or a torque. Do not work under a vehicle held only by a jack.
The plug that matches the gap in the engine table
No part number and no firing order are printed, so neither is added.
| Item | Figure | Where it comes from |
|---|---|---|
| 4.3L V6 (LV3) | VIN code H. Spark plug gap 0.95-1.10 mm (0.037-0.043 in). | Engine specifications |
| 5.3L V8 (L83) | VIN code C. Spark plug gap 0.95-1.10 mm (0.037-0.043 in). | Engine specifications |
| 6.2L V8 (L86) | VIN code J. Spark plug gap 0.95-1.10 mm (0.037-0.043 in). | Engine specifications |
The engine-specifications table lists VIN code H for the 4.3L LV3, C for the 5.3L L83, and J for the 6.2L L86.
Each of those three engines prints a spark plug gap of 0.95-1.10 mm (0.037-0.043 in).
No firing order is printed, so this page has no sequence drawing. The 6.0L L96 row in the same table is the heavy-duty engine and is not listed here. No plug part number is printed, so none is added.
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Tool
The plug that matches the gap in the engine table
No part number and no firing order are printed, so neither is added.
2018 Silverado owner's manual (opens in a new tab)Search Amazon.com (affiliate link) (opens in a new tab)
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These guides cover the same kind of work. Their numbers belong to those vehicles, not to this one.