GM LS1 Cathedral Port Low Rise EFI Modular Intake Manifold Black

Engineered for the GM LS cathedral port engines, the GM LS Cathedral Port Low Rise EFI Modular Intake Manifold in Black delivers a compact, bolt‑on powerhouse that blends street‑friendly fit with track‑ready performance. Designed to work with 102mm or 105mm throttle bodies and 14mm short injectors, this modular system puts you in control of airflow, fuel delivery, and bonnet clearance without compromising reliability.

Why choose this modular LS1 intake

• Modular design for tailor‑made setups: bottom base bolts to the cylinder heads, top plate bolts to the base with an O‑ring seal. Bases fit either cathedral port or rectangle port heads, giving you flexibility across LS configurations.
• EFI or non‑EFI options: choose EFI with 16 injector bosses (8 undrilled) complete with fuel rails and crossover, or a non‑EFI base with no injector bosses—perfect for custom fuel delivery or future upgrades.
• Compact, street‑friendly footprint: low‑rise design fits under a stock bonnet in most street car applications, while the short runners with a tapered top improve air velocity and throttle response.
• Precise port and sensor provisions: port size of 0.957" x 2.45", rear LS‑style map sensor provision, plus 3/8" NPT and 1/8" NPT ports with bungs for additional fittings.
• High‑quality, complete kit: includes Fuel Rail Kit, O‑ring gaskets, M6 hardware, washers, and port plugs—everything you need for a clean, reliable install.

Key specifications and dimensions

• Finish: Black powder coated (also available in natural cast)
• Throttle body compatibility: accepts 102mm/105mm GM LS 4‑bolt pattern on the snout
• Overall height (from front snout): 225mm (check bonnet clearance)
• Port size: 0.957" x 2.45"
• Gasket O‑ring: AF6999-1000
• NPT ports: 3/8" NPT (x1), 1/8" NPT (x1)
• Map sensor provision: 1 x LS style map sensor on the rear

Included components

• 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

Performance, design, and protection

• Short throttle body snout on the top plate to accommodate a 102mm four‑bolt GM LS throttle body, enabling strong, immediate throttle response.
• Burst panel welded into the top plate provides pressure relief (up to 200 psi) in the event of a backfire, protecting the manifold from damage and maintaining system integrity.
• Anderson‑style airflow efficiency: short runners with a tapered top maximize velocity and promote even air distribution to all eight cylinders, improving throttle response and mid‑range power.
• Versatile applications: designed to suit either non‑EFI configurations or EFI setups with injector bosses, plus LS map sensor provisions, making it adaptable for a range of engine builds—from street to drag race.

What makes it unique

• True modularity: separate the base and top plate for easy customization to cathedral or rectangle port heads, and to EFI or non‑EFI configurations, all while maintaining a solid seal via an O‑ring interface.
• High‑rpm capability without bonnet conflicts: the low‑rise form factor is specifically chosen to fit under most stock bonnets while still delivering efficient airflow and rapid throttle response for big‑cube LS builds.
• Build flexibility for injector sizing: EFI option supports 14mm short injectors (33mm length) with 16 total injector bosses, giving you room to optimize fuel delivery for your setup.

Whether you're building a streetable LS engine or chasing track‑day efficiency, this Aeroflow Performance GM LS modular intake manifold offers a precise blend of compact size, configurable EFI options, and robust components designed to handle demanding performance demands—without sacrificing bonnet clearance or reliability.