GM LS1 Cathedral Port Low Rise EFI Modular Intake Manifold

Engineered for the GM LS cathedral port family, the Aeroflow Performance GM LS Cathedral Port Low Rise EFI Modular Intake Manifold delivers a compact, high-flow solution that fits under most stock bonnets while unlocking serious performance. Built from cast aluminum and finished in natural cast, this modular design is as adaptable as your build.

• Throttle body and injector compatibility: Suits a 102mm or 105mm throttle body and 14mm short injectors, with a 4-bolt GM LS throttle body pattern on the snout.
• Compact, bonnet-friendly height: Overall height from the front snout is 225mm (bonnet clearance should be checked).
• Port and sensor provisions: Port size 0.957" x 2.45"; includes a GM LS style map sensor provision on the rear; 3/8" NPT port (x1) and 1/8" NPT port (x1).
• Gasket and sealing: Intake manifold gasket O‑ring (AF6999-1000) ensures a reliable seal between base and top plate.
• EFI vs NON-EFI flexibility: Choose between NON-EFI with no injector bosses or EFI with 16 injector bosses (8 undrilled), complete with fuel rails and crossover, designed to suit 14mm short-length (33mm) injectors.
• Included hardware and accessories: Fuel Rail Kit (AF6999-6003); 8 x intake manifold O‑ring gaskets (AF6233-5002); 8 x M6 x 1.00mm hex screws (45mm UHL); 8 x M6 flat washers; 1 x 3/8" NPT steel port plug; 1 x 1/8" NPT steel port plug.
• Modular design benefits: The bottom base bolts to the cylinder heads and the top plate bolts to the base with an O‑ring seal. Each base fits either cathedral port or rectangle port cylinder heads, and the top plate features a short throttle body snout to accept a 102mm GM LS throttle body. A burst panel welded on the top plate releases pressure (up to 200 psi) in the event of a backfire, protecting the manifold.
• Performance-focused runner design: Short intake runners with a tapered top increase air velocity and promote even airflow distribution across all eight cylinders, improving throttle response and mid-range power.
• Finish options: Available in natural cast or black powder coated finishes to suit your engine bay aesthetic and corrosion resistance needs.

The Aeroflow Performance GM LS modular intake manifold is designed to offer outstanding value for GM LS engine builds, delivering strong top-to-midrange power with a components-ready platform that can be tailored to street cars or drag-race configurations. Whether you’re aiming to preserve stock bonnet clearance or push for higher RPM horsepower, this low-rise, cathedral-port solution provides a practical, high-performance upgrade.