NGK Iridium IX Spark Plugs for Chevrolet Silverado 1500 5.3L/6.2L V8 (2014–2024) — 8 Pack, 0.040" Gap

NGK Iridium IX LTR5IX11 spark plugs are high-performance, long-life ignition components engineered to restore reliable starting, sharper throttle response, and consistent combustion for Chevrolet Silverado 1500 5.3L and 6.2L V8 engines (2014–2024).

These eight LTR5IX11 plugs are designed to match the factory specifications for Silverado 1500 V8 engines from 2014 through 2024 with a 0.040" gap. Built with a fine iridium center electrode and corrosion-resistant construction, the Iridium IX line focuses on sustained spark performance, reduced gap erosion, and improved ignitability compared with conventional plugs. Whether you’re maintaining mileage, correcting misfires, or prepping a truck for towing, replacing all eight plugs with NGK Iridium IX helps bring the ignition system back to optimal operating condition.

How do these plugs improve engine start-up and throttle response?

Iridium’s fine-wire center electrode concentrates spark energy, making ignition more reliable at cranking and under load. That sharper, more focused spark leads to faster combustion and a perceptible improvement in throttle pickup.

• Fine iridium center electrode for strong, concentrated sparks
• Stable 0.040" gap minimizes misfires during cold starts
• Consistent ignition across all eight cylinders for balanced performance

Will switching to NGK Iridium IX help fuel economy or reduce emissions?

By promoting more complete combustion, these plugs can help reduce unburned fuel and lower the frequency of misfires—both of which can positively affect fuel efficiency and exhaust cleanliness when the rest of the engine is in good condition. They are not a guaranteed cure for poor economy caused by other issues, but they remove ignition-related inefficiencies.

• Sharper spark reduces incomplete combustion events
• Lower misfire rates help maintain catalytic converter efficiency
• Durable materials resist electrode wear that degrades economy over time

How long do NGK Iridium IX plugs last compared to standard plugs?

Iridium alloy electrodes are far harder and more wear-resistant than traditional copper cores, which slows gap growth and extends useful service life. In everyday driving, you should expect these plugs to outlast standard replacements by a significant margin, although exact intervals depend on driving style and engine condition.

• Iridium center electrode resists erosion for longer service life
• Corrosion-resistant shell helps maintain sealing and electrical contact
• Designed to preserve 0.040" gap for extended consistent performance

Are these NGK plugs a direct fit for my Silverado 1500?

Yes—this listing contains eight LTR5IX11 spark plugs specifically matched to Chevrolet Silverado 1500 5.3L and 6.2L V8 models from 2014 through 2024 that require a 0.040" gap. They are intended as direct replacements when your vehicle uses the same NGK part designation.

• Vehicle coverage: Silverado 1500, 5.3L and 6.2L V8, model years 2014–2024
• Factory-style 0.040" gap pre-set for many compatible engines
• Sold as an 8-pack to service all cylinders in your V8

Who this is for: Pickup owners and professional technicians seeking a reliable, OEM-compatible ignition upgrade for Chevrolet Silverado 1500 5.3L and 6.2L V8 engines. Ideal for drivers who want improved ignition consistency, fewer misfires, and longer replacement intervals than standard plugs provide. If your Silverado shows hesitation, rough idle, or you’re simply performing scheduled maintenance, this eight-pack of NGK Iridium IX plugs offers a straightforward way to restore spark performance.