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Top Street Performance

Chevy LS3 Assembled Aluminum Cylinder Head

Chevy LS3 Assembled Aluminum Cylinder Head

SKU: JM4620

$695.00
$695.00
Shipping calculated at checkout.

Low stock

Top Street Performance (TSP) is committed to providing high-quality performance parts while complying with emissions regulations. This product is designed for use on vehicles that comply with federal emissions regulations. It is the customer’s responsibility to verify that this part is legal for use in their state or local jurisdiction. Check with your local emissions authority before purchasing.

Product Details

Features

  • 260cc intake runners support high-horsepower LS builds
  • 2.165"/1.590" stainless valves increase airflow capacity
  • 0.660" lift capability supports aggressive cam profiles
  • Fully assembled aluminum construction saves installation time

Description

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.

Specs

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 260cc
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

Engine Fitment

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)
CTS-V applications using compatible LS architecture
GM trucks and SUV applications using rectangular-port LS cylinder heads
LS swap projects using rectangular-port LS engines

NOTES
• Designed for rectangular-port LS intake manifold applications
• Fully assembled cylinder head
• Supports up to 0.660" valve lift
• Cylinder head sold individually (quantity of 2 required per engine)
• Verify intake manifold, rocker arm, valve cover, head gasket bore, and fastener compatibility before installation
• Not compatible with cathedral-port LS intake manifolds
• Not compatible with Gen V LT direct-injection engines
• Not compatible with Gen I Small Block Chevy or Big Block Chevy engines

Q&A

Are these cylinder heads fully assembled?
Yes, these heads come assembled with valves installed and are ready for final engine assembly.

What size intake runners do these heads use?
These cylinder heads feature 260cc intake runners.

What size combustion chambers do these heads use?
They utilize 64cc heart-shaped combustion chambers.

What valve sizes are included?
They include 2.165" intake valves and 1.590" exhaust valves.

What LS engines are these heads designed for?
They are designed for rectangular-port LS applications including LS3, L92, L99, L9H, L76, L77, and L98 engines.

Will these heads fit an LS3?
Yes, LS3 applications are one of the primary intended uses.

Will these heads fit an L92?
Yes, L92 rectangular-port applications are supported.

Are these compatible with cathedral-port LS engines?
No, these heads require rectangular-port intake manifold applications.

What is the maximum valve lift rating?
The valve spring package supports up to 0.660" lift.

What valve materials are used?
Stainless steel intake and exhaust valves are included.

Can these heads be used for an LS swap?
Yes, they are an excellent choice for rectangular-port LS swap projects.

Are these suitable for naturally aspirated and boosted builds?
Yes, the large 260cc runner design is well suited for both naturally aspirated and power-adder applications.

Emissions Notice

This product is legal for off road use and non pollution controlled vehicles (1965 & older); however, it has not been tested or approved by the California Air Resources Board (CARB) for highway vehicles in the state of California. By purchasing this product, buyer agrees it will not be used on pollution controlled vehicles in California, or in a state with similar emissions regulations.