Intake Manifold for Chevrolet Corvette (1997-2007) Cathedral Port Black w/Fuel Rail EFI

High-Flow Cathedral Port Intake Manifold for 1997-2007 Chevrolet Corvette (LS1/LS2/LS6 / C5/C6)

Designed for high-rpm performance builds: This single-plane EFI intake manifold replaces the restrictive factory composite unit to maximize airflow and fuel delivery for Cathedral Port LS engines operating in the 2500-7000 RPM range.

The Stock Corvette Airflow Limitation

The factory composite intake manifolds found on C5 and early C6 Corvettes are optimized for mid-range torque and strict emissions compliance, which fundamentally chokes high-rpm breathing. While the OEM plastic construction resists heat soak moderately well, the internal runner design limits plenum volume and becomes a severe bottleneck on modified 5.7L and 6.0L engines. Forced induction setups or aggressive cam profiles quickly outrun the factory flow characteristics, causing a steep drop in volumetric efficiency and power past 5,500 RPM. Additionally, the composite material can fail under extreme boost pressures.

The Engineering Solution

This satin aluminum single-plane intake manifold is engineered to eliminate high-rpm choking on Cathedral Port LS1, LS2, and LS6 blocks. By utilizing a 4150 square bore throttle body base combined with an included high-flow EFI fuel rail setup, it bridges the gap between classic hot-rod architecture and modern engine management. The 5.417-inch intake height and oversized 2.50" H x 1.15" W ports deliver a high-velocity, direct-line path into the cylinder heads. The robust cast aluminum construction allows for precision port-matching or aggressive forced induction pressures that would otherwise split a factory plastic manifold. Rated for peak efficiency between 2,500 and 7,000 RPM, it ensures consistent cylinder filling at the top end of the tachometer.

Technical Specifications

Compatibility

• GM LS1 Engines (Cathedral Port)
• GM LS2 Engines (Cathedral Port)
• GM LS6 Engines (Cathedral Port)

The Chevrolet Muscle Caliber

Built to handle the immense cylinder pressures of modified GM LS platforms, this aluminum manifold ensures your Corvette delivers the top-end power, structural rigidity, and reliable fuel distribution required for track days, drag passes, and high-performance street builds.