2.7L Turbo High-Output I-4 (also called TurboMax)
GM 2.7L TurboMax (Turbo High-Output I-4) engine (L3B)
OEM spark plugs are Iridium types, specifically GM Part #12688094
performance upgrades often suggesting NGK Ruthenium HX plugs for better heat management in turbocharged applications, gapped around .028"
Saturday, August 15, 2026
15 August 2026 - Part numbers
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