GM LS1 Cathedral Port Hi Rise EFI Modular Intake Manifold Black

GM LS1 Cathedral Port Hi Rise EFI Modular Intake Manifold — Black

Upgrade your GM LS cathedral port combo with Aeroflow’s GM LS1 Cathedral Port Hi Rise EFI Modular Intake Manifold in a durable black finish. Designed for maximum airflow and tuning flexibility, this modular setup lets you tailor the manifold to your engine and injection needs while delivering reliable, race-ready performance.

Why this manifold stands out

• Modular two-piece design: bottom base bolts to the cylinder heads and top plate bolts to the base, sealed with an O-ring for a reliable seal. The base is compatible with both cathedral port and rectangle port cylinder heads, giving you flexible installation options.
• Hi-rise long runners: optimized for high rpm horsepower on large displacement builds, making it a strong choice for drag racing and high-performance street cars alike.
• 102mm, 4-bolt GM LS throttle body snout: the top plate accepts a 102mm throttle body, expanding airflow potential while maintaining a compact overall height.
• Bonnet clearance awareness: overall height from the front snout is 300mm; check bonnet clearance to ensure proper fitment on your vehicle.
• EFI-ready with injector bosses: EFI variants feature 16 injector bosses complete with fuel rails and crossover, designed to suit 14mm short length (33mm) and 14mm full length (60.6mm) fuel injectors.
• Rear MAP sensor provision and multiple ports: includes a GM LS style map sensor provision on the rear, plus 3/8" NPT and 1/8" NPT ports for additional fittings or sensors.
• Durable cast aluminium construction with a black finish for a rugged, race-ready appearance.
• Pressure relief burst panel: welded on the top plate to release pressure (up to 200 psi) in the event of a backfire, helping protect your intake system.
• Bonnet-modification note: hi-rise designs may require bonnet modifications for fitment, a common consideration for this style of manifold.

What’s included and compatible

• Fuel Rail Kit (AF6999-6005)
• Intake Manifold O-Ring Gaskets (8 pieces)
• M6 x 1.00mm Hex Screws (45mm, 8 pieces)
• M6 Flat Washers (8 pieces)
• 3/8" NPT Port Plug (steel, 1 piece)
• 1/8" NPT Port Plug (steel, 1 piece)
• Intake manifold gasket O-Ring (AF6999-1000)
• Intake manifold base and top plate designed to be used with either NON-EFI (no injector bosses) or EFI (16 injector bosses) configurations

Technical specifications

• Intake manifold port size: 1.15" x 2.50"
• Overall height from front snout: 300mm (bonnet clearance to be checked)
• 3/8" NPT port (x1) and 1/8" NPT port (x1)
• GM LS style map sensor provision on the rear
• Material: cast aluminium with black finish (option for natural cast or black powder coat in other variants)
• Long, hi-rise runner design optimized for high-rpm horsepower on large displacement builds

Fitment and installation considerations

The modular design allows you to assemble a complete EFI manifold with 16 injector bosses, fuel rails, and crossover for 14mm injectors, or opt for a NON-EFI setup with no injector bosses if your build requires it. This manifold is intended for GM LS engines and is especially compatible with cathedral port configurations, with the top plate accepting a 102mm four-bolt throttle body. Due to the hi-rise design, bonnet clearance should be verified on your vehicle prior to installation.