GM LS Cathedral Port EFI Single Plane Aluminum Intake Manifold - Polished
GM LS Cathedral Port EFI Single Plane Aluminum Intake Manifold - Polished
SKU: SKU: 81137P
In stock
Product Details
Features
- Fits LS1, LS6, LS2, 5.3L & 6.0L cathedral-port engines
- Single-plane design improves high-RPM airflow
- Lightweight polished aluminum construction
- Fuel rails included for EFI applications
Description
Upgrade your LS-powered build with the Top Street Performance GM LS Cathedral-Port EFI Single Plane Aluminum Intake Manifold. Designed for Chevrolet LS cathedral-port engines, this high-performance EFI intake manifold delivers increased airflow, improved throttle response, and enhanced performance potential for street performance, LS swaps, drag racing, and street/strip applications.
Engineered with a single-plane runner design, this LS intake manifold is built to support increased airflow demands compared to many factory-style intake systems. The large plenum and performance-oriented runner configuration help maximize airflow efficiency, making it an excellent choice for naturally aspirated and boosted LS engine combinations seeking improved induction performance.
Constructed from lightweight polished aluminum, this EFI intake manifold provides excellent durability, corrosion resistance, and a clean performance appearance. Included fuel rails simplify installation and support modern electronic fuel injection systems, making this manifold a substantial upgrade for performance-minded enthusiasts.
Designed to fit a wide range of Chevrolet LS cathedral-port engines, including LS1, LS6, LS2, LM7, L59, LM4, L33, LH6, LC9, LH8, LQ4, LQ9, L98, and other compatible cathedral-port applications, this intake manifold is ideal for performance street vehicles, muscle cars, trucks, SUVs, and custom LS swap projects.
Whether you're upgrading an LS1-powered Camaro, LS6 Corvette, LS2 GTO, LM7 Silverado, LC9 Tahoe, or LQ9 performance truck build, this polished aluminum intake manifold delivers the airflow capacity, EFI compatibility, and performance-focused design serious LS enthusiasts demand.
Single Plane Intake Manifold Technology
The Top Street Performance LS Cathedral-Port EFI Single Plane Intake Manifold is engineered for enthusiasts seeking increased airflow and improved engine performance. Its single-plane design utilizes a common plenum layout that promotes stronger airflow and increased power production at higher RPM levels. Lightweight polished aluminum construction provides durability while maintaining a professional performance appearance.
Performance Benefits
The single-plane intake design is engineered to support increased airflow and improved throttle response compared to many factory-style intake manifolds. Its large plenum and performance-oriented runner design help maximize airflow efficiency, making it an excellent choice for street performance vehicles, LS swaps, naturally aspirated combinations, and boosted engine builds seeking improved induction performance.
Specs
| Basic Operating RPM Range | 2,500-7,000 RPM |
| Carburetor Flange Style | 4150 Square Bore |
| Carburetor Quantity | 1 |
| Center Maximum Height | 5.417 in. |
| Color | Polished |
| Deck Height | Standard |
| EGR Port | No |
| Front Maximum Height | 5.417 in. |
| Fuel Injection Style | Multi-port Fuel Injection |
| Fuel Injector Stye Provision | EV1 |
| Fuel Rail Color | Black |
| Fuel Rail Fitting Thread Diameter | -8 AN |
| Fuel Rail Material | Aluminum |
| Fuel Rails Included | Yes |
| Fuel System Type | Electronic Fuel Injection |
| Gasket Or Seal Included | Yes |
| Grade Type | Performance |
| Intake Port Shape | Cathedral |
| Material | Aluminum |
| Mounting Hardware Included | Yes |
| Mounting Hole Quantity | 10 |
| Rear Maximum Height | 5.417 in. |
| Single Or Dual Plane Type | Single Plane |
Engine Fitment
COMPATIBLE WITH
CHEVROLET LS CATHEDRAL-PORT ENGINES
• 4.8L / 293 in³ (LR4, LY2)
• 5.3L / 325 in³ (LM7, L59, LM4, L33, LH6, LC9, LH8)
• 5.7L / 346 in³ (LS1, LS6)
• 6.0L / 364 in³ (LQ4, LQ9, L98, LS2, LY6*, L76*)
*Cathedral-port applications only
COMMON VEHICLE APPLICATIONS
• Chevrolet Silverado
• GMC Sierra
• Chevrolet Camaro
• Chevrolet Corvette
• Chevrolet Tahoe
• Chevrolet Suburban
• GMC Yukon
• Chevrolet Avalanche
• Escalade
• Pontiac GTO
NOTES
• Fits Chevrolet LS cathedral-port engines only
• Single-plane intake manifold design
• Designed for electronic fuel injection systems
• Fuel rails included
• Verify injector, throttle body, fuel system, and hood clearance before installation
• Not compatible with LS3, L92, L99, LS7, LS9, LSA, or Gen V LT cylinder heads
Q&A
What engines is this intake manifold designed for?
This intake manifold fits Chevrolet LS cathedral-port engines including LS1, LS6, LS2, LM7, LC9, LQ4, LQ9, and other supported cathedral-port applications.
Will this intake manifold fit an LS1 engine?
Yes. LS1 applications are specifically listed in the published fitment.
Will this intake manifold fit an LS6 engine?
Yes. LS6 applications are specifically listed in the published fitment.
Will this intake manifold fit an LS2 engine?
Yes. LS2 cathedral-port applications are supported.
Will this intake manifold fit a 5.3 LS engine?
Yes. Supported 5.3L cathedral-port applications include LM7, L59, LM4, L33, LH6, LC9, and LH8 engines.
Will this intake manifold fit a 6.0 LS engine?
Yes. Supported cathedral-port 6.0L applications include LQ4, LQ9, L98, LS2, LY6, and L76 engines.
What is the benefit of a single-plane intake manifold?
A single-plane intake manifold helps improve airflow and horsepower potential at higher RPM levels, making it ideal for performance-oriented street and racing applications.
Are fuel rails included?
Yes. Fuel rails are included for EFI installation.
Is this intake manifold designed for boosted applications?
Yes. The high-flow design makes it suitable for naturally aspirated, turbocharged, and supercharged LS engine combinations.
Will this intake fit LS3 heads?
No. LS3, L92, L99, LS7, LS9, LSA, and Gen V LT cylinder heads are not compatible.
Emissions Notice
This Top Street Performance (TSP) product is designed for racing and off-road competition use only. It is not legal for use on public roads or emissions-controlled vehicles and does not comply with federal, state, or local emissions regulations. The buyer assumes all responsibility for legal use and installation.
What is a Emissions-Controlled Vehicle?
"An emissions-controlled vehicle is any vehicle equipped with a factory-installed emissions control system designed to reduce air pollution. These systems include catalytic converters, oxygen sensors, EGR (Exhaust Gas Recirculation) valves, and diesel particulate filters (DPF). Most vehicles manufactured after 1975 are considered emissions-controlled and must comply with federal and state emissions laws when used on public roads."
GM LS Cathedral Port EFI Single Plane Aluminum Intake Manifold - Polished
Upgrade your LS-powered build with the Top Street Performance GM LS Cathedral-Port EFI Single Plane Aluminum Intake Manifold. Designed for Chevrolet LS cathedral-port engines, this high-performance EFI intake manifold delivers increased airflow, improved throttle response, and enhanced performance potential for street performance, LS swaps, drag racing, and street/strip applications.
Engineered with a single-plane runner design, this LS intake manifold is built to support increased airflow demands compared to many factory-style intake systems. The large plenum and performance-oriented runner configuration help maximize airflow efficiency, making it an excellent choice for naturally aspirated and boosted LS engine combinations seeking improved induction performance.
Constructed from lightweight polished aluminum, this EFI intake manifold provides excellent durability, corrosion resistance, and a clean performance appearance. Included fuel rails simplify installation and support modern electronic fuel injection systems, making this manifold a substantial upgrade for performance-minded enthusiasts.
Designed to fit a wide range of Chevrolet LS cathedral-port engines, including LS1, LS6, LS2, LM7, L59, LM4, L33, LH6, LC9, LH8, LQ4, LQ9, L98, and other compatible cathedral-port applications, this intake manifold is ideal for performance street vehicles, muscle cars, trucks, SUVs, and custom LS swap projects.
Whether you're upgrading an LS1-powered Camaro, LS6 Corvette, LS2 GTO, LM7 Silverado, LC9 Tahoe, or LQ9 performance truck build, this polished aluminum intake manifold delivers the airflow capacity, EFI compatibility, and performance-focused design serious LS enthusiasts demand.
Single Plane Intake Manifold Technology
The Top Street Performance LS Cathedral-Port EFI Single Plane Intake Manifold is engineered for enthusiasts seeking increased airflow and improved engine performance. Its single-plane design utilizes a common plenum layout that promotes stronger airflow and increased power production at higher RPM levels. Lightweight polished aluminum construction provides durability while maintaining a professional performance appearance.
Performance Benefits
The single-plane intake design is engineered to support increased airflow and improved throttle response compared to many factory-style intake manifolds. Its large plenum and performance-oriented runner design help maximize airflow efficiency, making it an excellent choice for street performance vehicles, LS swaps, naturally aspirated combinations, and boosted engine builds seeking improved induction performance.
COMPATIBLE WITH
CHEVROLET LS CATHEDRAL-PORT ENGINES
• 4.8L / 293 in³ (LR4, LY2)
• 5.3L / 325 in³ (LM7, L59, LM4, L33, LH6, LC9, LH8)
• 5.7L / 346 in³ (LS1, LS6)
• 6.0L / 364 in³ (LQ4, LQ9, L98, LS2, LY6*, L76*)
*Cathedral-port applications only
COMMON VEHICLE APPLICATIONS
• Chevrolet Silverado
• GMC Sierra
• Chevrolet Camaro
• Chevrolet Corvette
• Chevrolet Tahoe
• Chevrolet Suburban
• GMC Yukon
• Chevrolet Avalanche
• Escalade
• Pontiac GTO
NOTES
• Fits Chevrolet LS cathedral-port engines only
• Single-plane intake manifold design
• Designed for electronic fuel injection systems
• Fuel rails included
• Verify injector, throttle body, fuel system, and hood clearance before installation
• Not compatible with LS3, L92, L99, LS7, LS9, LSA, or Gen V LT cylinder heads
SPECIFICATIONS:
Basic Operating RPM Range: 2,500-7,000 RPM
Carburetor Flange Style: 4150 Square Bore
Carburetor Quantity: 1
Center Maximum Height: 5.417 in.
Color: Polished
Deck Height: Standard
EGR Port: No
Front Maximum Height: 5.417 in.
Fuel Injection Style: Multi-port Fuel Injection
Fuel Injector Stye Provision: EV1
Fuel Rail Color: Black
Fuel Rail Fitting Thread Diameter: -8 AN
Fuel Rail Material: Aluminum
Fuel Rails Included: Yes
Fuel System Type: Electronic Fuel Injection
Gasket Or Seal Included: Yes
Grade Type: Performance
Intake Port Shape: Cathedral
Material: Aluminum
Mounting Hardware Included: Yes
Mounting Hole Quantity: 10
Rear Maximum Height: 5.417 in.
Single Or Dual Plane Type: Single Plane
