GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13690468) - 2021 - CRC - 2/18/20
398 Technical Data
Engine Specifications
Engine VIN Code Spark Plug Gap
5.3L V8 Engine (L84) D 0.95–1.10 mm (0.037–0.043 in)
6.2L V8 Engine (L87) L 0.95–1.10 mm (0.037–0.043 in)
Spark plug gaps are preset by the manufacturer. Re-gapping the spark plug is not recommended and can damage the spark plug.
Engine Drive Belt Routing
If the vehicle has a diesel engine, see the
Duramax diesel supplement.
5.3L and 6.2L Engines
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