Gen 5 LT1 Cylinder Head to LT4 Supercharger Adap

The ICT Billet Gen 5 LT1 Cylinder Head to LT4 Supercharger Adapter (part number 551590) is a precision-engineered intake manifold spacer designed for modern GM Gen V LT-series engine builds. This aluminum rectangle port adapter bridges the dimensional and port geometry differences between LT1 cylinder heads and LT4 supercharger installations, enabling seamless integration of forced-induction systems on LT1-based platforms without extensive machine work or custom fabrication.

Machined from billet aluminum and finished to OEM specifications, the adapter measures 4 x 1.8 x 17.6 inches and weighs 2.97 lbs, ensuring minimal mass penalty while maintaining structural rigidity under boost pressure. The 1/2-inch thickness provides the necessary stacking height to match port centers and accommodate gasket compression. The kit includes all required O-rings and hardware for direct installation, eliminating the need to source fasteners separately or source alternative gasket solutions. Rectangle port geometry maintains flow efficiency at the critical junction between cylinder head and supercharger manifold, preserving boost delivery characteristics across the RPM range.

This adapter is essential for engine builders and performance enthusiasts upgrading LT1-equipped vehicles—such as Chevrolet Camaros, Corvettes, and Silverados—to LT4 supercharger packages. It eliminates guesswork on port spacing and sealing, reducing risk of vacuum leaks, coolant bypass, or boost loss that commonly occur with improvised solutions. The billet construction resists thermal warping and corrosion, critical for maintaining reliability in high-boost applications where intake manifold integrity directly affects tuning stability and engine durability.