High-Performance Spark Plugs for Chevrolet & GMC LS Engines

Premium Iridium Core - Engineered for superior conductivity and extended lifespan, reducing misfires and improving throttle response.

Precision-Gapped Electrodes - Factory-set 0.040" gap ensures optimal combustion efficiency for 5.3L, 6.0L, and 6.2L LS/L99 engines.

Direct OEM Replacement - Exact match for GM part #12621258, compatible with LS1/LS2/LS3/LS6 platforms.

CNC-Machined Steel Shell - Corrosion-resistant construction with triple-seal design to prevent gas leakage under high-pressure conditions.

Ideal for Performance Upgrades - Perfect for street builds, towing applications, and track-tuned LS engine configurations.

Global Wholesale Pricing - Factory-direct bulk purchasing with unmatched value for repair shops and fleet operators.