LS1 Cathedral Port Carburettor Street Single Plane Intake Manifold

Transform your GM LS cathedral-port engine from EFI to a dependable non-EFI carb setup with Aeroflow Performance’s Street low-rise, cast intake manifold. Built for street and light-track use, this single-plane design delivers steady, even air and fuel flow into the engine’s cathedral-port LS1/LS2 heads for reliable power delivery across the RPM band.

Key features

• 4150 square-bore carburetor pad (4160 flange) compatible with aftermarket 4-barrel carburetors, with both manual and electric choke options available on today’s market
• Fits GM LS1/LS2 cathedral-port engines; designed specifically for non-EFI applications and retro-fit conversions
• Single-plane configuration focused on high-RPM performance and steady intake air/fuel flow
• Natural cast finish for a rugged, traditional appearance under the hood
• RPM operating range: 2500 to 7000 for versatile street and performance scenarios
• Overall height from carb pad to bottom of manifold: 122 mm (bonnet clearance should be checked)
• Port size: 0.95" x 2.45"

Technical specifications

• Carburetor pad: square bore 4150 flange
• Gasket O-Ring: AF6233-5002
• Carburetor studs: 5/16-18" (x4)
• Port plug: 3/8" NPT (x1)
• Mounting holes: six 5/16-18"

What’s included

• 8 x Intake Manifold O-Ring Gaskets (AF6233-5002)
• 4 x M6 x 1.00 mm hex screws (80 mm overall height engagement)
• 6 x M6 x 1.00 mm hex screws (50 mm engagement)
• 10 x M6 flat washers
• 1 x 3/8" NPT steel port plug

Convert your GM LS engine to a non-EFI carburettor setup with confidence using this Aeroflow Performance Street low-rise cast intake manifold. It’s purpose-built to support LS Gen III and IV platforms equipped with OE or aftermarket LS1/LS2 cathedral-port cylinder heads, delivering a practical, high-performance upgrade without the complexity of EFI.