Satin Aluminum Single-Plane EFI Engine Intake Manifold, designed for Chevy, Pontiac, Cadillac, and GMC LS1, LS2, LS6 engines (300-137). Made from high-quality aluminum with a satin finish, this single-plane design maximizes airflow potential for increased power gains, ideal for forced induction applications. Features include a 4150 square bore flange, front and rear heights of 5.417", and port dimensions of 2.50" H x 1.15" W. Optimized for the 2,500–7,000 RPM power band, this manifold provides reliable construction and enhanced engine performance for LS engine enthusiasts.