SPARKWHIZ UF413 Square Ignition Coils with 8mm 748UU Spark Plug Wires — Set of 8, Copper Windings

The SPARKWHIZ UF413 kit is a plug-and-play set of eight square-body ignition coils with matching 8mm 748UU spark plug wires designed to improve spark consistency and durability for compatible GM vehicles.

If your vehicle uses square-style UF413/D510C coils, this complete set replaces worn factory units with higher-discharge coils and fresh OE-style spark plug wires. The kit is built for direct replacement, manufactured with copper windings and reinforced insulation to withstand heat and vibration encountered in daily driving and performance use. Before ordering, verify fitment by year/make/model or compare your original coils to ensure you need the square-body UF413 rather than the round UF414 style.

How do these UF413 coils improve ignition performance?

These coils deliver a stronger, more consistent spark than many aged factory units by increasing discharge energy, which helps with reliable combustion across cylinders. They’re engineered for plug-and-play installation so you retain factory harnesses and mounting points.

• Higher-energy copper windings for robust spark delivery
• Designed to match OE mounting and electrical connectors
• Durable polyester rubber wrapping to resist heat and abrasion

Will the included 8mm 748UU spark plug wires fit my vehicle?

The 8mm 748UU wires in this kit are standard OE-style leads intended to pair with UF413 coils on compatible GM models. Fitment depends on vehicle year and engine layout; always check the product fitment tool or compare wire lengths and terminals to your original set.

• OE-style 8mm diameter for common GM ignition systems
• Pre-measured lengths to replace factory routing without modification
• Insulated to reduce crossfire and withstand engine bay heat

How difficult is installation and what tools or tips help?

Installation is straightforward for anyone comfortable with basic engine bay work: remove old coils and wires, and install the new UF413 coils into the same mounting points. Use care with rubber boots—apply a light silicone spray to prevent tearing during assembly and use original tools where possible to avoid damaging connectors.

• Plug-and-play electrical connectors match factory harness
• Recommend silicone lubricant on rubber boots during installation
• Follow torque and handling guidance from vehicle manufacturer

What vehicles and part numbers are these compatible with?

This SPARKWHIZ set references multiple OEM numbers and fits select models from Cadillac, Hummer, Chevrolet, and GMC. Compatibility varies by engine and production year; check the drop-down fitment or compare part numbers to your original coils before purchase.

• Cross-references: C1511, UF413, D510C, D513A, 5C1554, IC533
• Also lists factory numbers like 12570616, 12611424, 8125706160 for verification
• Designed for square-body coil applications—verify against round-body UF414

Who this is for: Mechanics, DIY enthusiasts, and drivers seeking a reliable replacement or upgrade for square-body ignition systems who need a full set of coils and matched spark plug wires. If you want straightforward, long-lasting ignition components that keep your engine firing evenly and reduce electrical misfires, this complete SPARKWHIZ UF413 kit is tailored to those replacing worn factory parts or refreshing an older ignition system. Always confirm vehicle fitment and coil body style before ordering.