EVIL ENERGY Ignition Coil UF271 Replacement for GM L-Series Truck Engines High Performance Upgrade

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Brand	EVIL ENERGY
Product Type	Ignition Coils
OEM Replacement	UF271
Spark Energy	111mJ
Spark Duration	2.331 mS
Maximum Voltage	50000V
Primary Resistance	0.97 ohms
Secondary Resistance	6.24k ohms
Turns Ratio	86

 

VEHICLE COMPATIBILITY

Cadillac

Model	Year	Engine
Escalade	2003-2006	6.0L V8

Chevrolet

Model	Year	Engine
Avalanche 1500	2006	5.3L V8
Avalanche 2500	2003-2006	8.1L V8
Silverado 1500	1999-2006	4.8L V8
Silverado 1500	2006	5.3L V8
Silverado 1500	2004-2006	6.0L V8
Silverado 1500 HD	2001-2006	6.0L V8
Silverado 2500	1999-2004	6.0L V8
Silverado 2500 HD	2001-2006	6.0L V8
Silverado 2500 HD	2003-2006	8.1L V8
Silverado 3500	2001-2006	6.0L V8
Silverado 3500	2003-2006	8.1L V8
Suburban 1500	2006	6.0L V8
Suburban 2500	2000-2006	6.0L V8
Suburban 2500	2003	8.1L V8
Tahoe	2000-2006	4.8L V8
Tahoe	2006	5.3L V8

GMC

Model	Year	Engine
Sierra 1500	1999-2006	4.8L V8
Sierra 1500	2006	5.3L V8
Sierra 1500	2005	6.0L V8
Sierra 1500 HD	2001-2006	6.0L V8
Sierra 2500	1999-2004	6.0L V8
Sierra 2500 HD	2001-2006	6.0L V8
Sierra 2500 HD	2003-2006	8.1L V8
Sierra 3500	2001-2006	6.0L V8
Sierra 3500	2003-2006	8.1L V8
Yukon	2000-2006	4.8L V8
Yukon	2005-2006	5.3L V8
Yukon	2001	6.0L V8
Yukon XL 1500	2006	5.3L V8
Yukon XL 1500	2001-2006	6.0L V8
Yukon XL 2500	2000-2006	6.0L V8
Yukon XL 2500	2003	8.1L V8

Hummer

Model	Year	Engine
H2	2003-2006	6.0L V8

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Need to replace OE UF271? EVIL ENERGY high‑performance ignition coils deliver stronger ignition and improved durability. Straight plug‑and‑play installation boosts power and efficiency for daily driving or mild builds.

Is your Chevy Silverado or GMC Sierra suffering from sluggish acceleration, rough idles, or persistent misfires? These are classic signs of aging GM ignition coils. Don't let a weak spark compromise your engine's potential. Whether you’re maintaining a daily driver, hauling heavy loads with a Silverado 2500 HD, or completing a high-performance LS swap, the EVIL ENERGY LS Ignition Coil kit is the ultimate upgrade to restore lost pony power and improve fuel economy.

Engineered for superior combustion efficiency and an enhanced driving experience, EVIL ENERGY ignition coils deliver a perfect balance of performance, reliability, and durability for your engine.

Precision Engineering & Specifications

Engineered to exceed OE UF271 standards, our GM HEI coil set delivers 15%-20% higher energy than stock units.

• Max Voltage: 50,000V (Eliminates high-RPM blow-out)
• Spark Energy: 111mJ for complete combustion
• Compatibility: Optimized for Chevrolet ignition coil replacements across 4.8L, 5.3L, 6.0L, and 8.1L V8 engines.
• Build Quality: Features premium silicon steel cores and German-imported varnished wire for ultimate reliability.

Product Features: The EVIL ENERGY Advantage

• Boost Power & Fast Ignition: Our GM HEI coil provides a lightning-fast ignition response and ultra-strong combustion. By delivering up to 50,000V, this LS ignition coil set increases horsepower and sharpens throttle response, significantly improving the overall performance of your HEI ignition system.
• Reduce Jitter & Rough Idle: This ignition coil Chevrolet kit effectively minimizes engine vibration, shaking, and uneven idling. Replacing a faulty GM coil pack ensures smoother acceleration and stable operation, eliminating the 'stutter' often found in high-mileage Chevrolet ignition coils.
• Ultimate Combustion Efficiency: By optimizing the HEI ignition spark, our coils improve fuel atomization. This high-efficiency GM HEI ignition process reduces fuel waste and enhances overall fuel economy, making it a cost-effective ignition coil kit for long-distance drivers.
• High-Temperature & Extreme Condition Resistance: Constructed with high-quality, heat-resistant materials, the EVIL ENERGY LS Ignition Coil is built to endure extreme engine temperatures. Whether facing 122°F heat or -22°F cold starts, this HEI ignition coil maintains a stable voltage output where others fail.
• Stable & Durable Professional Build: Specifically designed for the LS coils architecture, our hardware features a robust structure for an extended lifespan. This EVIL ENERGY Ignition Coil provides consistent reliability for both heavy-duty towing in a Chevy Silverado and high-revving performance in LS ignition coils builds.
• Plug-and-Play Efficiency: Designed as a direct ignition coil kit replacement, the straight-forward installation boosts HEI ignition efficiency for both daily commutes and mild builds.

Solve Ignition & Running Issues with EVIL ENERGY

Is your vehicle throwing a Check Engine Light or struggling to stay on the road? Our EVIL ENERGY LS Ignition Coil kit is specifically engineered to target and eliminate the most common failures found in aging HEI ignition setups.

• Eliminate No-Start Conditions: A weak or dead GM coil pack is often the culprit behind frustrating no-start scenarios. Our high-output LS ignition coil ensures a reliable, high-voltage spark is delivered every time you turn the key, restoring your HEI ignition system to factory-fresh reliability.
• Stop Unexpected Vehicle Vibration: If you feel your Chevy Silverado shaking at stoplights, you likely have a misfiring Chevrolet ignition coil. By upgrading to a full ignition coil kit, you restore perfect engine balance and eliminate the jitter caused by inconsistent spark delivery.
• Clear Illuminated Fault Lights: Dealing with persistent P0300 or P0305 codes? Our GM HEI coil is a direct-fit solution designed to clear misfire-related fault lights. Replacing your old LS coils with EVIL ENERGY hardware ensures your ECU receives the stable feedback it needs for error-free operation.
• Fix High Fuel Usage: Inefficient combustion from a worn-out GM HEI ignition module or weak Chevrolet ignition coils leads to unburnt fuel exiting the exhaust. Our EVIL ENERGY Ignition Coil optimizes the combustion cycle, stabilizing fuel consumption and saving you money at the pump.
• Restore Stable Performance: Whether it's a heavy-duty towing session or a spirited drive, our HEI ignition coil provides the consistent voltage required for stable, peak-performance running conditions across all LS ignition coils applications.

Application

• The Workhorse: Restore towing confidence in your Silverado 1500 or Sierra 3500.
• The Custom Build: The go-to LS coils for Gen III/IV LS engine projects requiring a reliable GM HEI ignition module interface.
• The Family SUV: Ensure a smooth, vibration-free ride for Cadillac Escalade, Tahoe, and Yukon passengers.