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6.2L LS3 V8 · Cylinder Head

Spark plug

Tightening procedure

  1. Torque 11 lb-ft · 15 N·m

Tools

  • spark plug socket

Notes

Single-source and reported in the LT section; confirm the LS3 aluminum-head value (commonly lower, around 11 lbft when reusing) before publishing. Catalog PN: GM 12621258 per figure GM00-039 callout 726 — "SPARK PLUG,(GAP 0.040)(ACDelco #41-110)(IRIDIUM) — Required: 08, Y 6.2W(LS3) (2008-2011). 0.040 in (1.0 mm) gap, iridium tip. ACDelco cross #41-110."

Sources

  • GM Fastener Tightening Specifications (6.2L LS3), Document ID 2296270
  • 2011 Chevrolet Corvette Parts Catalog (GM Professional, Dec-11 supersedes May-11)Captured 2026-05-28

Values are cited as facts. We do not reproduce the manufacturer's prose, table layout, or diagrams.