UF413 Square Ignition Coils with 8mm 748UU Spark Plug Wires - Coil

In this review of the UF413 Square Ignition Coils with 8mm 748UU Spark Plug Wires, the bottom line is simple: this kit is aimed at owners of compatible Chevy, GMC, Cadillac, Pontiac and Hummer models who need a direct plug-and-play replacement that boosts spark consistency. The reviewer found the set delivers stronger discharge energy than many factory coils and includes durable OE style wires, making it a practical choice for routine replacement or a modest performance-minded refresh. Check compatibility carefully because there are two coil body styles and choosing the wrong one is the most common error.

Key Features

• Direct plug-and-play: The kit is designed to replace factory coils without modification, which simplifies installation for most technicians and DIYers.
• Higher discharge energy: These coils provide a stronger and more consistent spark than some stock units, which can improve ignition stability under normal driving conditions.
• Complete set: Includes eight UF413 square ignition coils plus eight 8mm 748UU standard OE spark plug wires so the whole ignition bank is refreshed at once.
• Durable construction: Coils use German copper windings wrapped in polyester rubber and wires follow OE standards for everyday durability.
• Wide compatibility: Matches several OEM part numbers like C1511, UF413, D510C, and 5C1554 for many Chevy, GMC, Cadillac, Pontiac and Hummer applications when the square style is required.

Who It's For

This kit is best for vehicle owners who know they need the square body UF413/D510C style coils and want a full bank replacement for consistent ignition across all cylinders. It suits do-it-yourselfers who prefer plug-and-play parts and shops that service late-model GM V6 and V8 engines listed by the interchangeable part numbers.

It is not ideal for buyers who are unsure which coil body style their vehicle uses; there is also mixed feedback on wire quality, so customers seeking premium aftermarket wires or race-level performance should consider higher-end wire sets separately.

Pros & Cons

Pros

• Complete 8-coil and 8-wire kit refreshes the entire ignition bank for consistent operation.
• Stronger discharge energy compared with many stock coils, improving spark reliability.
• Easy installation when the correct square body style is chosen, and seller support is available by email.

Cons

• Two coil body styles exist (round and square), and choosing the wrong type is a common source of returns and confusion.
• Some customers reported inconsistent wire quality and occasional misfires on a small number of cylinders.

Specifications

Brand	SPARKWHIZ
Coil model	UF413 / D510C (square body)
Includes	8 ignition coils and 8 8mm 748UU spark plug wires
OEM part numbers	C1511, UF413, D510C, D513A, 5C1554
Wire type	Standard OE 8mm 748UU
Construction	German copper coils wrapped in polyester rubber

Our Verdict

The UF413 square coil and wire set is a sensible, cost-conscious choice for owners who confirm their vehicle needs the square style and want a full bank replacement. It offers improved ignition consistency over many stock coils and a complete wiring refresh, making it good value for routine maintenance or modest performance improvement, though buyers should inspect original coils to avoid selecting the wrong body style.

Frequently Asked Questions

How do I know if I need the square UF413 coils?
Check your original coils visually for square versus round body shape or confirm fitment using model year and OEM part numbers; the seller also advises using the year/make/model selection to verify compatibility.

Are the spark plug wires high performance?
The kit includes standard OE 8mm 748UU wires suitable for typical driving and replacement needs, but buyers seeking premium or race wires may prefer an upgraded separate set.

What should I do during installation to avoid damage?
The manufacturer recommends spraying silicone on the coil rubber during assembly to prevent cracking and using original tools where possible to avoid damaging components.