SPARKWHIZ UF271 Square Ignition Coils & D581 Kit with 748EE Wires & Spark Plugs — 12558693 for GMC Sierra, Silverado, Tahoe, Avalanche, Suburban

Overview

Meet SPARKWHIZ UF271 Square Ignition Coils, a comprehensive kit designed to refresh GM V8 ignition systems. This package combines UF271 square coils with the D581 family, a set of 8mm spark plug wires, and eight spark plugs. Engineered for consistency across daily driving and occasional heavier use, the kit aims to deliver reliable spark delivery for engines commonly found in Silverado, Suburban, Tahoe, Avalanche, and more.

Whether you’re maintaining a trusty daily driver or planning a longer road trip, this kit presents a practical upgrade path that emphasizes practical reliability and smoother starts. While actual results can vary, refreshed ignition components can help keep your engine firing on all cylinders when you need it most.

What’s Included

• UF271 square ignition coils (D581) for square-coil applications
• Eight 8mm spark plug wires for consistent resistance and spark paths
• Eight spark plugs to complete a full ignition refresh

Key Benefits

• Durable copper windings wrapped in a rugged polyester jacket to withstand heat and road conditions
• 8mm wires designed to maintain steady, reliable ignition performance across environments
• Comprehensive kit structure that supports a full ignition refresh, reducing mismatches between components
• German-inspired coil design elements paired with practical automotive plastics for long service life

Fitment and Vehicle Range

This UF271/D581 square coil set is compatible with a broad range of GM trucks and SUVs, including Chevrolet Avalanche (2002–2006), Silverado (1999–2007), Tahoe (2000–2006), Suburban (2000–2006), Express (2003–2006), Sierra 1500 (1999–2006), Monte Carlo, and related models. Some variants may list additional equipment or different coil shapes; always verify coil shape in your engine bay before purchase. This listing specifically covers SQUARE UF271/D581 coils.

Important Coil Shape Note

PLEASE NOTE: the same vehicle type may use different coil shapes, SQUARE (UF271/D581) or ROUND (UF262/D585). To avoid installation problems, check your engine compartment and confirm the coil shape. This ASIN is for SQUARE UF271/D581 coils.

What This Means for Your Drive

As ignition components come closer to spec, drivers may experience more predictable starts, steadier idle, and smoother throttle response. Individual results vary, but a refreshed ignition kit can support reliable operation during daily commutes and longer trips alike.

Why Choose SPARKWHIZ

SPARKWHIZ focuses on practical, durable ignition solutions that fit a wide range of GM-powered vehicles. The UF271 kit blends robust coil technology with standard-wrapped, heat-resistant components to deliver a balanced upgrade for drivers seeking dependable ignition performance without surprises.