EVIL ENERGY Cast Aluminum Cylinder Head for LS1 Engines (Angled Plug) – Cathedral Ports, Fits 1997-2003 Chevy LS1, Enhances Mid-High RPM Performance

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Vehicle Compatibility

• Fits 1997-2003 Chevrolet LS1 V8 engines (exclusively for LS1 models; not compatible with other LS-series variants)
• Angled-plug design: Aligns with LS1 factory ignition system layouts; no block modifications needed for direct replacement of OEM cast-iron heads

Brand	EVIL ENERGY
Spark Plug Type	LS1 Angled Plug
Fuel Type	Gasoline Engine Cylinder Head
Valve Configuration	Overhead Valve (OHV)
Material	Cast Aluminum
Weight	25.9lb（11.75kg）
Vehicle Compatibility	1997-2003 LS1
Combustion Chamber Volume	66.5cc
Intake Runner Volume	210cc
Exhaust Runner Volume	82cc
Intake Valve Diameter	2.020-inch
Exhaust Valve Diameter	1.600-inch
Valve Stem Diameter	0.316-inch
Intake Valve Angle	15°
Exhaust Valve Angle	15°
Combustion Chamber Style	Heart-Style
Cooling System	Water-Cooled

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Upgrade your engine's breathing capabilities with EVIL ENERGY LS heads. Engineered specifically for the iconic GM LS1 platform, these LS1 heads feature a cast aluminum construction and precision-machined cathedral ports. Designed to optimize airflow efficiency, they significantly enhance torque and horsepower in the mid-to-high RPM range, making them the ideal choice for street performance and track builds.

Technical Specifications

• Product: EVIL ENERGY LS1 Head (Angled Plug Style).
• Material: Lightweight Heat-Treated Cast Aluminum.
• Intake Runner Volume: 210cc (Cathedral Ports) – Optimized for high velocity.
• Combustion Chamber: 66.5cc – Maintains factory-like compression for pump gas compatibility.
• Performance Range: Idle to 6,000 RPM (Strong low-mid range torque).
• Fitment Type: Direct Bolt-on for LS1 Engines.

EVIL ENERGY LS1 Head 

High-Performance Cast Aluminum Cylinder Head (210cc / 66.5cc) | Fits 1997-2003 Chevy LS1

Upgrade your engine with the EVIL ENERGY LS1 Head, a high-performance cast aluminum cylinder head engineered exclusively for 1997–2003 Chevy LS1 platforms. Featuring precision-cast 210cc cathedral ports and 66.5cc combustion chambers, this head is designed to optimize airflow and combustion efficiency specifically for street applications.

Unlike race-only heads, these EVIL ENERGY LS heads are tuned for responsive acceleration and torque under 6,000 RPM. This makes them the most reliable LS1 cylinder heads for daily drivers, tow vehicles, and street performance builds seeking durable, affordable power.

• Street Performance Focus: The EVIL ENERGY LS head is tuned for mild LS1 modifications, pairing perfectly with high-flow intake manifolds to enhance mid-range acceleration. This makes it an excellent Aluminum Cylinder Head upgrade for daily-driven or street-performance LS1 head applications.
• Low-to-Mid RPM Optimization: Designed for reliable power delivery under 6,000 RPM, the EVIL ENERGY LS heads provide excellent balance between performance and durability. Perfect for tow vehicles, hot rods, and casual racing builds, these LS  heads avoid the long-term stress of sustained high RPM operation.
• OEM Compatibility: Built to match GM OEM LS1 geometric angles, this LS1 head preserves compatibility with factory pistons. As a direct replacement, the EVIL ENERGY LS head ensures hassle-free installation while upgrading strength and efficiency over stock cylinder heads.
• OHV & Gasoline - Engine Cylinder Head Advantage: Engineered with an OHV (Overhead Valve) design, the EVIL ENERGY LS heads deliver strong torque output at low-to-mid RPM, making them ideal for street cars, tow vehicles, and hot rods. Optimized combustion chambers allow higher air intake capacity, supporting turbocharged or supercharged systems, and helping these LS1 heads achieve superior fuel efficiency and power delivery at mid-to-high RPM track performance levels.

2. Design & Material Benefits

• Lightweight Cast Aluminum: The EVIL ENERGY LS head is built from lightweight aluminum, significantly lighter than OEM iron engine heads. This reduces front-axle load, improves vehicle weight distribution, and enhances both handling and acceleration—making it a superior choice among performance LS heads and LS1  heads.
• Superior Heat Dissipation: Thanks to its Aluminum Cylinder Head construction, the EVIL ENERGY LS heads lower engine operating temperatures, minimizing knock risk. This is critical for maintaining performance in LS1’s naturally aspirated or mild forced-induction setups, giving these LS1 heads a clear advantage over stock iron designs.
• Optimized Cathedral Port Design: Featuring 210cc intake runners, the EVIL ENERGY LS head improves mid-to-high RPM airflow. Its cathedral port shape optimizes intake velocity, supporting both naturally aspirated and mild forced-induction builds. Whether upgrading OEM cylinder heads or building custom LS1-powered street cars, these LS1 heads deliver reliable airflow and power.

3. Key Notes

• Bare-cast version: Does not include valves, springs, seals, or assembled components (separate hardware required for installation)
• Fitment Restriction: Exclusively for 1997-2003 LS1 engines; not compatible with other LS-series (e.g., LS2, LS3) or non-LS Chevy engines
• This item is sold as a single cylinder head, not a pair.

Who Needs the EVIL ENERGY LS1 Head?

We engineered the EVIL ENERGY LS1 Head not for peak-RPM dyno queens, but for real-world driving. This LS1 head is tuned to solve specific problems for three distinct types of automotive enthusiasts:

1. The Street Performance Enthusiast

• Who You Are: You drive a Corvette C5, Camaro SS, or Trans Am on the street. You want responsive power for highway passing and stoplight acceleration, not just high-RPM track numbers.
• Why You Need This: Unlike massive race heads that lose low-end power, our EVIL ENERGY heads feature 210cc cathedral ports. This design maintains high air velocity, delivering instant throttle response and increased torque in the idle-to-6,000 RPM range—exactly where street cars spend 90% of their time.

2. The Restoration & Repair Mechanic

• Who You Are: You are rebuilding a tired 1997-2003 LS1 engine or dealing with warped/cracked factory heads due to overheating or high mileage.
• Why You Need This: Stop gambling on used junkyard parts. This is a brand-new cast aluminum LS1 head that serves as a direct, reliable replacement for OEM castings (e.g., 241 or 853 heads). It restores compression and efficiency to your engine at an affordable price point.

3. The LS Swap & Tow Vehicle Builder

• Who You Are: You are swapping an LS1 engine into a pickup truck (Silverado/Sierra) or a classic muscle car aimed at cruising and towing.
• Why You Need This: You need torque to move weight. The 66.5cc combustion chambers and flow characteristics of these LS1 heads are optimized for combustion efficiency. This provides the strong low-to-mid-range grunt required for towing trailers or moving heavy custom builds without struggling at low speeds.