Chevy LS3 Aluminum Cylinder Head

Build your cathedral-port LS engine with a bare aluminum cylinder head engineered for high-performance applications. Featuring large 260cc cathedral-style intake runners, 68.4cc heart-shaped combustion chambers, cathedral intake ports, and D-port exhaust ports, this cylinder head is designed to support the airflow demands of serious LS street, racing, and LS swap combinations.

The large 260cc runner design provides substantially increased airflow capacity compared to many factory cathedral-port castings, making this cylinder head an excellent choice for larger displacement LS engines, stroker combinations, naturally aspirated performance builds, and power-adder applications. The heart-shaped combustion chamber promotes efficient combustion while supporting improved horsepower and torque potential.

As a bare casting, this cylinder head gives builders complete freedom to select valves, springs, retainers, seals, and valvetrain components that match their specific camshaft profile and performance goals. This flexibility makes it ideal for custom engine builds, machine shop assembly, drag racing applications, and high-performance street projects.

Constructed from lightweight aluminum, this cylinder head helps reduce weight while dissipating heat more efficiently than traditional iron cylinder heads. Whether you're building a high-performance 5.3L, 5.7L, 6.0L, stroker LS combination, or a custom LS swap project, this bare cylinder head provides the airflow foundation needed for serious power production.

 

Cylinder Head Technology
Designed with large 260cc cathedral-style intake runners, 68.4cc heart-shaped combustion chambers, cathedral intake ports, and D-port exhaust ports, this aluminum cylinder head is engineered to maximize airflow in cathedral-port LS engine applications. The bare casting configuration allows builders to customize the valvetrain and cylinder head assembly to match specific performance requirements.

Performance Benefits
The 260cc runner design helps support increased airflow and cylinder filling at higher RPM levels, making this cylinder head an excellent choice for larger displacement LS engines and performance-focused builds. Aluminum construction helps reduce weight and dissipate heat efficiently, supporting improved horsepower potential and overall engine performance.

COMPATIBLE WITH
GM LS SERIES V8 ENGINES - RECTANGULAR PORT
• 6.0L / 364 in³ (L76, L77, L98)
• 6.2L / 376 in³ (LS3, L92, L99, L9H)
• 7.0L / 427 in³ (LS7 requires application-specific verification)

COMMON VEHICLE APPLICATIONS
Chevrolet Corvette (LS3)
Chevrolet Camaro (LS3/L99)
Chevrolet SS
Pontiac G8
CTS-V
GM trucks equipped with compatible rectangular-port LS engines
LS swap projects using rectangular-port cylinder heads

NOTES
• Designed for rectangular-port LS applications
• Requires rectangular-port intake manifold
• Sold individually (quantity of 2 required per engine)
• Verify rocker arm, valve cover, gasket bore, and fastener compatibility
• Not compatible with cathedral-port intake manifolds
• Not compatible with Gen V LT direct-injection engines
• Not compatible with Small Block Chevy or Big Block Chevy engines

SPECIFICATIONS
Assembled: No
Combustion Chamber Style: Heart
Combustion Chamber Volume: 68.4 cc
Cylinder Head Finish: Natural
Cylinder Head Material: Aluminum
Exhaust Port Location: Standard
Exhaust Port Shape: D-port
Intake Port Location: Standard
Intake Port Shape: Cathedral
Intake Runner: 260 cc
Quantity: Sold Individually
Valve Guide Material: Bronze