SPARKWHIZ Set of 8 UF413 Ignition Coils with Iridium Spark Plugs & 8mm Wires — Complete 8-Cylinder Replacement Kit

SPARKWHIZ Set of 8 UF413 ignition coils with matching iridium spark plugs and 8mm wires is a plug-and-play replacement kit designed to restore reliable spark delivery across all eight cylinders.

This complete ignition kit combines UF413 high-energy coils, precision iridium spark plugs and OE-standard 8mm spark plug wires to address misfires, rough idle or reduced responsiveness caused by worn ignition components. The parts are engineered to match factory fitment for select Cadillac, Hummer, Chevrolet and GMC applications, making it a practical service solution when multiple ignition components need replacement at once.

How do these UF413 coils and iridium plugs improve engine ignition?

The UF413 coils are wound with high-conductivity German copper and insulated with durable polyester rubber to deliver consistent discharge energy. Iridium spark plugs have a hard, high-melting-point electrode that maintains spark integrity longer than standard plugs, reducing the risk of intermittent misfires.

• Higher discharge energy than many factory coils for dependable spark.
• Iridium tips resist wear and sustain a stable spark gap over time.
• Durable coil insulation helps tolerate thermal and electrical stress.
• Matched wiring ensures correct resistance and minimal signal loss.

Will this kit fit my vehicle and how do I confirm compatibility?

The kit is intended for specific models and years of Cadillac, Hummer, Chevrolet and GMC that use UF413-style ignition coils. Always verify OEM part numbers and cross-reference your vehicle’s VIN or the fitment guide before ordering to ensure correct match.

• Check OEM part numbers: C1511, UF413, D510C, D513A, 5C1554, IC533, 12570616, 12611424 and equivalents.
• Use the vehicle fitment tool or confirm with your VIN to avoid ordering errors.
• Compare the physical shape and connector type to the existing coils on your engine.

What should I know about installation and maintenance?

Installation is typically straightforward for mechanically inclined DIYers because the coils are direct replacements for factory units. Taking a few precautions during assembly helps prevent damage to rubber components and ensures a long service life.

• Spray a light layer of silicone lubricant on rubber coil boots during assembly to prevent cracking.
• Use original or manufacturer-recommended tools to avoid over-torquing or damage.
• Replace wires and plugs as a set to maintain consistent electrical characteristics across cylinders.

What durability and performance features does this set offer?

Materials and construction choices aim to extend service intervals and maintain stable ignition under varied driving conditions. The kit is built for durability and consistent performance without changing engine tuning or requiring additional parts.

• German copper coils for reliable conductivity and reduced internal resistance.
• Polyester rubber wrapping for improved thermal and abrasion resistance.
• Iridium electrodes for long-term spark stability and minimal erosion.
• 8mm OE-standard wires to match factory resistance and fitment dimensions.

Who this is for: This SPARKWHIZ kit is appropriate for vehicle owners and independent mechanics who need an all-in-one ignition refresh for engines using UF413-style coils—especially when multiple cylinders show aging signs or when replacing just one part would leave mixed old and new components. It suits owners of compatible Cadillac, Hummer, Chevrolet and GMC models seeking a straightforward, OEM-alike replacement that emphasizes durability and consistent spark delivery. If you’re unsure about fitment, consult the vehicle’s service manual or use VIN-based tools before purchasing.