GBTAD Ignition Coil Pack and Spark Plug Wire Harness Kit for GM 5.3L V8 (2007–2011) — Set of 8, Square Coils, Direct-Fit

GBTAD Set of 8 square ignition coil packs with a spark plug wires harness is a direct-fit replacement kit designed to restore reliable spark delivery for many GM 5.3L V8 engines from 2007–2011.

This complete kit combines eight square-style ignition coils with a matched spark plug wire harness engineered to match factory routing and electrical characteristics. It’s intended for Chevrolet, GMC, Buick and Cadillac models that use these part numbers and coil form factors. The components are built with high-density epoxy and copper conductor materials to provide consistent conductivity and mechanical protection compared with worn or damaged original parts.

Which vehicles and part numbers does this kit fit?

This set is manufactured to fit a range of GM trucks and SUVs using the square ignition coil form. It lists compatibility for many Chevrolet Silverado, Avalanche, Tahoe, Suburban, Camaro, Corvette, Impala and related GMC, Buick and Cadillac models. Always verify fitment by matching part numbers on your original coils.

• Common referenced part numbers: UF413, 12570616, D510C, 12611424 and related OEM codes.
• Designed for 5.3L V8 engines in 2007–2011 model years where square coils are used.
• Compatible vehicle families include Chevy, GMC, Buick and Cadillac (see product listing for full model list).
• Compare your factory coil shape and connector to the kit photos before ordering.

How do these coils and wires improve engine operation?

Replacing aged coils and brittle spark plug wires helps restore strong, consistent spark timing to the combustion chamber. That addresses symptoms like misfires, rough idle and intermittent check-engine lights caused by ignition faults. While results depend on the vehicle’s overall condition, fresh coils and a proper wire harness reduce ignition-related drivability issues.

• Restores ignition voltage stability across all eight cylinders.
• Reduces misfire risk caused by cracked wires or degraded coil windings.
• Matched harness routing prevents wire interference and maintains factory routing.
• High-density epoxy sealing protects coil internals from moisture and vibration.

What should I check before buying to ensure correct fit?

Because GM used different coil designs across similar engines, confirm your existing coil’s shape, connector style and OEM number before purchase. Installing an incompatible coil will prevent starting or proper operation. The kit also includes images and part numbers to help you compare.

• Match the coil housing shape and number of electrical pins to your originals.
• Verify OEM or stamped part numbers on your factory coils against listed codes.
• Inspect spark plug boot style and harness length for correct routing in your engine bay.
• Contact customer service with vehicle VIN and photos if unsure.

How easy is installation and what tools are needed?

Installation follows standard ignition-coil replacement steps and can be performed with common hand tools. Basic mechanical skill and a torque wrench for coil mounting bolts will make the job straightforward for most DIYers. If you’re not comfortable working around the ignition system, a professional installation is recommended.

• Typical tools: ratchet, socket set, torque wrench and dielectric grease for boots.
• Procedure: disconnect battery, remove coil packs, swap wires, install new coils, torque bolts to spec.
• Estimated time: 1–2 hours for a mechanically inclined DIYer on most models.
• Keep original part numbers and photos for reference if returning or warranty needed.

Who is this for: This GBTAD kit is intended for owners and technicians repairing ignition faults on GM 5.3L V8s from the late 2000s who need a full set replacement—especially when multiple coils or the original wire harness show wear, cracking, or electrical failure. It’s suitable for DIY mechanics wanting a direct-fit aftermarket option and for shops performing multi-cylinder ignition repairs. Always confirm your vehicle’s coil type and OEM numbers against the kit’s listings before purchase to ensure compatibility.