Chevy LS3 Assembled Aluminum Cylinder Head

Upgrade your rectangle-port LS engine with a fully assembled aluminum cylinder head engineered for high-performance street, racing, and LS swap applications. Featuring large 260cc intake runners, 64cc heart-shaped combustion chambers, and 2.165" intake / 1.590" exhaust stainless steel valves, these cylinder heads are designed to support the airflow demands of LS3, L92, L99, L76, L77, L98, and compatible rectangular-port LS engine combinations.

The large 260cc intake runner design provides exceptional airflow capacity for larger displacement LS engines, stroker combinations, naturally aspirated builds, and power-adder applications. Combined with high-flow ports and oversized stainless steel valves, these heads help improve cylinder filling, throttle response, torque production, and horsepower potential throughout the RPM range.

Constructed from lightweight aluminum, these cylinder heads help reduce weight while dissipating heat more efficiently than traditional cast iron designs. Stainless steel valves, bronze valve guides, steel valve seats, and chromoly steel retainers provide durability for demanding street and racing environments.

With valve spring capability supporting up to 0.660" lift, these assembled cylinder heads are well suited for performance camshaft upgrades and high-output LS engine combinations. Delivered assembled with valves installed, they provide a strong performance foundation for enthusiasts seeking increased airflow and proven LS performance.

Whether you're upgrading an LS3-powered Camaro, building a performance Corvette, assembling a high-output street machine, or completing a serious LS swap project, these assembled aluminum cylinder heads deliver the airflow capacity and durability needed for substantial power gains.

 

Cylinder Head Technology
Designed with large 260cc intake runners, 64cc heart-shaped combustion chambers, and 2.165" intake / 1.590" exhaust stainless steel valves, these assembled aluminum cylinder heads are engineered for high-flow rectangular-port LS applications. Bronze valve guides, steel valve seats, and chromoly retainers provide durability for demanding street and racing environments.

Performance Benefits
The large 260cc runner design helps maximize airflow and cylinder filling, making these cylinder heads ideal for larger displacement LS engines, stroker combinations, and performance builds requiring increased horsepower potential. With valve spring capability supporting up to 0.660" lift, these heads are well suited for aggressive camshaft profiles, naturally aspirated builds, and power-adder combinations.

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 equipped)
Chevrolet Camaro (LS3 / L99 equipped)
Chevrolet SS / Pontiac G8 (LS3 / L76 equipped)
Cadillac CTS-V applications using compatible LS architecture
GM trucks and swaps using rectangular-port LS cylinder heads

NOTES

Designed for rectangular-port LS intake manifold applications.

Verify intake manifold, rocker arm, valve cover, head gasket bore, and head bolt/stud compatibility before installation.

Cylinder head sold individually (purchase quantity of 2 required for complete engine).

Not compatible with cathedral-port LS intake manifolds, Gen V LT direct-injection engines, Gen I SBC, or Big Block Chevy engines.

Specifications:
Assembled: Yes
CNC Ported: No
Combustion Chamber Style: Heart
Combustion Chamber Volume: 64 cc
Deck Height: Standard
Deck Thickness: Standard
Exhaust Crossover: No
Exhaust Port Location: Standard
Exhaust Port Shape: D-port
Exhaust Valve Diameter: 1.590 in.
Exhaust Valve Material: Stainless Steel
Finish: Natural
Grade Type: Performance
Guide Plate Material: Bronze
Intake Port Location: Standard
Intake Port Shape: Cathedral
Intake Runner Volume: 260 cc
Intake Valve Diameter: 2.165 in.
Intake Valve Material: Stainless Steel
Material: Aluminum
Quantity: Sold Individually
Valve Guide Material: Bronze
Valve Seat Material: Steel
Valve Spring Maximum Lift: 0.660 in.
Valve Spring Retainer Material: Chromoly Steel
Valve Springs Included: No
Valves Included: Yes