LS3 Rectangle Port Carburettor Hi Rise Single Plane EFI Intake Manifold Black

LS3 Rectangle Port Hi Rise Single Plane EFI Intake Manifold

Upgrade your GM LS3 EFI setup with Aeroflow Performance’s Hi Rise Race cast intake manifold designed for rectangle port cylinder heads. This single‑plane, 4150 square‑bore design concentrates air and fuel delivery for aggressive throttle response and steady flow across a wide RPM range, making it a compelling choice for street and race applications alike.

Key Features

• Square bore carburettor pad (4150 flange) tailored for aftermarket 4150 square‑bore throttle bodies or adapters
• Overall height (carb pad to bottom) 172 mm — check bonnet clearance before install
• Port Size: 1.08" x 2.45" for GM LS3 rectangle port heads
• Intake gasket: flat style, must use Fel Pro 1222-2 or 1222-3
• 5/16-18" carburettor studs (x4) for secure mounting
• 4 x M6 x 1.00mm mounting holes for fuel rails
• Includes: 10 x M6 x 1.00mm hex screws (50 mm UHL) and 10 x M6 flat washers
• Single plane configuration with high rise design for maximum air velocity and fuel distribution
• Black finish for a sleek, aggressive look under the hood

What’s Included

• Intake Manifold: 4‑barrel 4150 square bore, hi rise, EFI application
• Fuel Rail Kit Includes:
  • 2 x Fuel Rails (-8ORB)
  • 1 x -8AN crossover braided line with two 90° non‑full‑flow fittings
  • 3 x -8AN to -8ORB fittings
  • 1 x -8ORB hex port plug
  • 4 x mounting brackets
  • 6 x M6 x 1.00mm socket cap screws (25 mm UHL)
  • 6 x M6 x 1.00mm hex screws (12 mm UHL)
  • 4 x M6 nuts

Compatibility & Installation Notes

• Designed to fit GM LS Gen III and IV engines with OEM or aftermarket LS3 rectangle port heads
• EFI applications only — use AF6240-6005 for NON‑EFI installations
• Does not work with factory OEM fuel rails; requires Aeroflow Fuel Rail Kit (AF6999-5000)
• Requires 14 mm short injectors (sold separately)
• RPM operating range: 2500–7000
• Gasket compatibility: Fel Pro 1222‑2 or 1222‑3 required

Why This Manifold Stands Out

Designed to maximize air and fuel delivery with a stable, even flow, this hi rise single‑plane intake keeps mixture moving efficiently into the engine across high RPMs. The 4150 square‑bore pad accommodates a wide range of throttle bodies and adapters, making it a versatile choice for performance builds that demand reliable EFI integration on GM LS3 rectangle port cylinder heads. The included fuel rail kit eliminates uncertainty around compatibility, ensuring a complete retrofit path for EFI LS engines with aftermarket rails.