Ignition Coil & Spark Plug for GMC Sierra 1500 2500 HD 3500 HD (2007-2016) V8 (Round Style)

High-Output Ignition Coil & Spark Plug Kit for 2007-2016 GMC Sierra V8

Directly replaces degraded OEM round-style ignition coils, wires, and spark plugs to restore maximum voltage output, resolving misfires and hesitation under heavy load.

The Stock Sierra Ignition Weakness

The factory OEM coils on GM's Gen IV Vortec V8 engines frequently suffer from thermal degradation and epoxy housing fractures. Repeated extreme heat cycling in the engine bay causes the internal potting to crack, leading to increased primary resistance and weak spark blow-out when the engine is subjected to heavy towing or payload demands. Over time, the factory spark plug wire insulation also breaks down, causing parasitic voltage leaks to the engine block and triggering persistent P0300-series misfire diagnostic trouble codes.

The Engineering Solution

This comprehensive ignition kit utilizes upgraded D514A/UF414 round-body coil packs engineered with an advanced thermal epoxy construction to resist heat soak and vibration. Operating with a 61:1 turns ratio and a peak maximum voltage of 32,000V, these units deliver 20% more spark energy than the standard OEM components. High-conductivity durable copper internal wire winding ensures minimal voltage drop, while the housings offer superior dielectric strength. The included 748UU silicone-jacketed spark plug wires prevent arcing, and paired with the 41962 spark plugs, the system guarantees a complete burn for restored throttle response and fuel efficiency. Note: This kit is strictly for applications equipped with factory round coils and will not fit models utilizing the square body UF413/D510C.

Technical Specifications

Compatibility

• Cadillac Escalade
• Chevrolet Avalanche
• Chevrolet Silverado
• Chevrolet Suburban
• Chevrolet Express
• Chevrolet Tahoe
• Chevrolet Trailblazer
• GMC Savana
• GMC Yukon
• Hummer H3

The GMC Heavy-Duty Standard

When it comes to hauling heavy payloads or trailering over steep grades, consistent spark delivery is critical to maintaining power and preventing detonation. Upgrading your Sierra's ignition system ensures rock-solid dependability and maximum torque output when you need it most.