Ignition Coil & Spark Plug for Pontiac G8 Grand Prix GTO (2005-2009) V8 (Round Style)

High-Output Ignition Coil & Spark Plug Set for 2005-2009 Pontiac G8, Grand Prix, GTO

What it Does: This comprehensive ignition service kit replaces degraded factory round-style D514A ignition coils, spark plugs, and wires to restore spark energy and eliminate misfires on LS-powered Pontiacs.

The Stock LS-Series Ignition Weakness

The OEM LS-series ignition coils—specifically the round-body variants—are notorious for degrading over time due to constant thermal cycling and localized engine bay heat soak. As the internal epoxy potting breaks down and the secondary resistance shifts, spark output diminishes drastically. This degradation leads to common V8 driveability issues, including rough idling, hesitation under heavy throttle, and high-RPM misfires. Furthermore, standard factory plug wires suffer from carbon core breakdown and insulation cracking, causing high-voltage leaks to the block that compromise combustion efficiency and sap overall horsepower.

The Engineering Solution

This complete ignition package overhauls the factory setup with coils featuring an optimized internal copper wire winding and a high-grade epoxy core to resist vibration and heat saturation. Designed with a 61:1 turns ratio and a peak maximum voltage output of 32,000V, these direct-replacement coils deliver 20% more discharge energy than standard OE components for a consistently stronger, fatter spark. Paired with low-resistance 748UU plug wires and matching spark plugs (41-962 spec), the system ensures a complete fuel burn, sharpens throttle response, and stabilizes the idle curve across all operating temperatures. Note: This kit specifically requires the round-style coil fitment (UF414/D514A) and will not fit square-style setups.

Technical Specifications

Compatibility

• Pontiac G8 (2008-2009, V8 with Round Coils)
• Pontiac Grand Prix (2005-2008, GXP V8 with Round Coils)
• Pontiac GTO (2005-2006, V8 with Round Coils)
• Cadillac Escalade
• Chevrolet Avalanche
• Chevrolet Silverado
• Chevrolet Suburban
• Chevrolet Express
• Chevrolet Tahoe
• Chevrolet Trailblazer
• GMC Savana
• GMC Yukon
• Hummer H3

The Pontiac Muscle Standard

Whether you are carving corners in a Zeta-platform G8 or laying down massive torque in an LS2 GTO, this upgraded ignition kit ensures your LS-powered muscle car maintains the raw horsepower, instantaneous throttle response, and aggressive exhaust note it was engineered for.