GM LS3 Intake Manifold Dual-Plane 4150 Flange

The GM LS3 Intake Manifold Dual-Plane 4150 Flange by Holley is engineered for builders and enthusiasts who demand precision fuel delivery and optimized airflow in high-performance LS-series engines. Built for street and track applications where intake efficiency directly impacts throttle response and power delivery, this manifold addresses the critical interface between your engine's induction system and carburetor or EFI setup. Whether upgrading a stock LS3 or building a complete performance package, the dual-plane design balances cylinder charge distribution to maximize torque across a usable RPM range.

Constructed from lightweight aluminum with a natural finish, this intake manifold features a dual-plane runner layout that separates cylinder groups for improved low-to-mid-range torque production. The 4150 flange configuration accepts square-bore carburetors or compatible throttle bodies and integrates with rectangle-port cylinder heads common to the LS3 platform. At 18.1 pounds, the aluminum construction reduces engine bay weight while the dual-plane geometry reduces cross-cylinder scavenging losses, resulting in more consistent combustion and measurable power gains over single-plane alternatives on street-driven builds.

This manifold is ideal for LS3 engine swaps, restorations, and performance upgrades where fuel distribution precision matters. It pairs seamlessly with rectangle-port LS3 heads and accommodates both naturally aspirated and moderate boost applications on builds prioritizing usable torque over peak horsepower numbers. Installation requires proper gasket sealing and alignment with your cylinder head ports; the natural aluminum finish requires appropriate intake sealing compound to prevent vacuum leaks. Verify your specific LS variant and carburetor bore diameter before ordering to ensure compatibility with your induction system.