LS Cathedral Port Carburettor Hi Rise Race Single Plane EFI Manifold Black

LS Cathedral Port Hi Rise Race EFI Manifold – Black

Unlock optimized airflow and high‑RPM performance on GM LS1/LS2 cathedral‑port engines with this Hi Rise, single‑plane EFI intake manifold. Designed for EFI applications, it enables 4150 square‑bore throttle bodies or adapters for retro‑fits, giving you a steady, even air/fuel distribution from ~2500 to 7000 RPM.

• Cathedral port compatibility: specifically fits GM LS1/LS2 cathedral‑port cylinder heads
• EFI only: engineered for electronic fuel injection; non‑EFI applications require AF6040-5005
• Hi Rise, single‑plane configuration to maximize top‑end power while preserving mid‑range efficiency
• Carburettor pad: 4150 square‑bore flange; uses aftermarket 4150 throttle bodies or adapter plates
• Overall height: 172 mm from carb pad to bottom of manifold (check bonnet clearance)
• Port size: 1.08" x 2.45"
• Gasket compatibility: flat style gasket—Fel Pro 1312-2 or 1312-3 recommended
• Carburettor studs: includes 4 x 5/16-18" studs
• Fuel rails mounting: 4 x M6 x 1.00mm mounting holes for rails
• Intake manifold includes: 10 x M6 x 1.00mm hex screws (50 mm UHL) and 10 x M6 flat washers

Fuel rails, installation, and injectors

• Fuel rails kit required: Aeroflow Fuel Rail Kit AF6999-5000 is included with the manifold
• Note: This manifold does not work with factory OEM fuel rails
• Injector requirement: uses 14 mm short injectors (sold separately)
• Fuel rails kit contents: two fuel rails (-8ORB), -8AN crossover braided line with two 90° fittings, -8AN to -8ORB adapters and fittings, -8ORB port plug, mounting brackets, and assorted screws/nuts

The Aeroflow Performance Hi Rise cast intake manifold is designed to convert your GM LS engine to accommodate a 4150 style throttle body on top, making it ideal for retrofit applications with OE or aftermarket LS1/LS2 cathedral port heads. Its precisely engineered air and fuel pathway helps maintain a steady flow into the engine for reliable power delivery across the intended RPM range, giving you controlled, high‑performance EFI calibration potential.

• RPM operating range: 2500–7000
• Finish: Black
• Engine family: GM LS Gen III/IV with LS1/LS2 cathedral port heads
• Compatibility: EFI applications only; not compatible with factory fuel rails
• Retrofit readiness: accepts aftermarket 4150 square‑bore throttle bodies or adapter plates