GM LS3 Rectangle Port Carburettor Single Plane EFI Intake Manifold

GM LS3 Rectangle Port EFI Single Plane Intake Manifold

Convert your GM LS engine to accept a 4150-style throttle body with Aeroflow Performance’s Street low rise cast intake manifold. This single-plane EFI manifold is designed to keep air and fuel flowing smoothly for maximum power, specifically for GM LS Gen III/IV engines equipped with LS3 rectangle port heads. The natural cast finish adds a rugged, performance-ready look to your engine bay.

• 4-barrel 4150 square-bore carburettor pad for aftermarket throttle bodies or adapter plates
• EFI applications only – does not work with factory OEM fuel rails (requires Aeroflow Fuel Rail Kit AF6999-6000)
• Fits GM LS3 Rectangle Port Engines; low rise single-plane configuration for peak RPM performance
• RPM operating range: 2500 to 7000
• Carburettor pad to bottom height: 122 mm (check bonnet clearance)
• Port size: 1.15" x 2.50"
• Gasket O‑Ring included (Intake Manifold Gasket O‑Ring, AF6233-5002)
• Carburettor studs: 4 × 5/16-18"
• Port: 3/8" NPT (x1)
• Mounting holes: 6 × 5/16-18"

Intake Manifold Includes: 8 × Intake Manifold O‑Ring Gaskets (AF6233-5002); 4 × M6 × 1.00 mm Hex Screws (80 mm UHL); 6 × M6 × 1.00 mm Hex Screws (50 mm UHL); 10 × M6 Flat Washers.

Fuel Rail Kit includes: 2 × Fuel Rails (-8ORB); 1 × -8AN crossover 100-series braided line with two 90-degree non-full-flow fittings; 3 × -8AN to -8ORB fittings; 1 × -8ORB hex port plug; 6 × long mounting brackets; 6 × short mounting brackets; 6 × 5/16-18" hex screws (18.5 mm UHL); 6 × 5/16-18" hex screws (12 mm UHL); 4 × M6 nuts; 8 × 14 mm Fuel Injector O‑Rings.

Injector compatibility: requires either 14 mm short injectors (33.60 mm length) or ¾" length injectors (48.65 mm) (sold separately).

This intake manifold is specifically designed for GM LS Gen III and IV engines equipped with OE or aftermarket LS3 rectangle port cylinder heads, delivering a steady, even air/fuel distribution for high-performance street and racing applications.