ICT Billet Cathedral Port Cylinder Head To LS3 Rectangle Port Intake Manifold Adapter

The ICT Billet Cathedral Port to LS3 Rectangle Port Intake Adapter Kit lets you run rectangle port intake manifolds on LS cathedral port cylinder heads, making it a practical solution for LS builds that need to bridge the port mismatch without changing heads.

Machined from USA-produced billet aluminum, these 1/2" thick adapter plates provide a clean mounting surface and reliable seal between the cylinder heads and intake manifold. The kit includes adapter plates, O-rings, and required hardware for installation.

This kit is also compatible with Magnuson rectangle port supercharger systems, making it useful for cathedral port LS combinations where a rectangle port intake or supercharger is being used.

Key Features

• Adapts LS cathedral port cylinder heads to rectangle port intake manifolds
• Compatible with Magnuson rectangle port supercharger systems
• CNC-machined from billet aluminum
• 1/2" thick adapter plate design
• Includes adapter plates, O-rings, and installation hardware
• Made in the USA

Note: Some intake manifolds may require alignment pin modification to sit flush on the adapters.