Ignition Coil & Iridium Spark Plugs & Wire Chevrolet Silverado 2500 HD 3500 HD (2020) 6.6L V8

High-Energy Ignition Coil & Iridium Spark Plug Kit for Chevrolet Silverado

Replaces failing factory ignition components to restore proper combustion, eliminate misfires, and improve throttle response under heavy loads.

The Stock Silverado L8T Heat Soak Problem

The stock Silverado L8T ignition system degrades over time due to intense thermal cycling under the hood, especially when towing or hauling heavy payloads. Continuous high-temperature exposure breaks down the factory coil epoxy and degrades spark plug electrodes, leading to increased electrical resistance. This manifests as weak spark output, engine misfires, rough idling, hesitation during acceleration, and inevitable Check Engine Light (CEL) or StabiliTrak/VSC warnings. Left unaddressed, poor ignition efficiency accelerates fuel waste and exhaust emissions.

The Engineering Solution

This comprehensive ignition overhaul kit is engineered to exceed OE specifications, delivering a 20% increase in spark energy and stepping up voltage to a maximum of 26,000 Volts (61:1 turns ratio). The UF742 coils feature premium internal copper windings and high-temperature epoxy construction to resist heat soak and heavy-duty vibration. Paired with 41-114 iridium spark plugs—chosen for their extremely high melting point and superior conductivity—this setup ensures a powerful, consistent spark event. The included 8mm spark plug wires utilize a high-density silicone sleeve and specialized heat shields to eliminate RFI electronic interference and prevent cross-firing, ensuring maximum voltage transfer directly to the combustion chamber.

Technical Specifications

Compatibility

• 2020 Chevrolet Silverado 2500 HD 6.6L V8 (Gasoline)
• 2020 Chevrolet Silverado 3500 HD 6.6L V8 (Gasoline)
• Replaces OE Coils: 12658183, 12621750, 12674754, 12699383, 12708496, 5C1876, U5265, 48881, C1819, C866, GN10165
• Replaces OE Wires: 12192195, 12622553, 88862397, 12192192, 9748GG, 748GG, 7873
• Replaces OE Plugs: 41-114

The Chevrolet Heavy-Duty Standard

Designed to endure the grueling demands of heavy towing, payload hauling, and continuous job-site idling, these upgraded ignition components ensure your heavy-duty Silverado maintains optimal power delivery and reliability.