LS1 Cathedral Port Carburettor Street Single Plane Intake Manifold Black

Convert your GM LS engine from EFI to a classic carburettor setup with this Aeroflow Performance Street low rise cast intake manifold. Built for LS Gen III and IV cathedral-port cylinder heads, this single-plane manifold channels air and fuel with precision to maximize street and enthusiast-level performance. Finished in stealthy Black, it accepts aftermarket 4150 square-bore carburettors with either manual or electric choke options.

Key features

• Single Plane configuration for strong high-RPM power delivery
• 4-barrel 4150 square-bore carburettor pad (4150 flange)
• Black finish for a clean, aftermarket-ready appearance
• Designed for GM LS1/LS2 cathedral-port engines (Non-EFI applications)
• Carburettor mounting pad accepts aftermarket 4150 square-bore carburettors

Technical specifications

• RPM operating range: 2500–7000
• Overall height: 122 mm from carb pad to bottom of manifold (check bonnet clearance)
• Port size: 0.95" x 2.45"
• Carburettor pad: Square bore, 4150 flange
• 5/16-18" carburettor studs (x4)
• 3/8" NPT port (x1)
• 6 x 5/16-18" mounting holes

What’s included

• 8 x Intake Manifold O-Ring Gaskets (AF6233-5002)
• 4 x M6 x 1.00 mm hex screws (80 mm UHL)
• 6 x M6 x 1.00 mm hex screws (50 mm UHL)
• 10 x M6 flat washers
• 1 x 3/8" NPT steel port plug
• Carburettor gasket O-Ring (AF6233-5002) included with manifold

Compatibility and installation notes

• Intended for retro-fitting GM LS engines from EFI to Non-EFI carburettor setups
• Specifically designed for GM LS Gen III and IV engines with OE or aftermarket LS1/LS2 cathedral-port cylinder heads
• Supports manual or electric choke 4150 square-bore carburettors
• Bonnet clearance should be checked due to the manifold’s height (122 mm overall)

Why choose this manifold

For enthusiasts seeking a reliable, street-friendly path to carburettor-fed LS power, this street low-rise manifold delivers consistent air and fuel distribution across all runners, enabling smooth throttle response and solid top-end performance. The included hardware and O-Ring gaskets simplify installation, while the rugged black finish provides a clean, race-ready look that pairs well with a wide range of LS builds.