Hi Ram Intake Manifold Base EFI LS1/LS2/LS6

The Hi Ram Intake Manifold Base EFI LS1/LS2/LS6 from Holley is engineered for serious engine builders and performance enthusiasts looking to unlock the full potential of their Gen III/IV small-block LS platform. This base manifold forms the foundation of a high-flowing induction system, designed specifically to support EFI fuel injection on LS1, LS2, and LS6 cylinder heads. Whether you're building a street machine, track car, or crate engine swap, this component delivers the flow characteristics and structural integrity required for reliable power production across the entire RPM band.

Constructed with precision casting and optimized runner geometry, the Hi Ram base manifold minimizes turbulence and promotes efficient air distribution to each cylinder while accommodating modern electronic fuel injection systems. The design separates intake charge into individual runners that taper progressively toward the valve seat, reducing restrictions and improving velocity—critical factors in extracting maximum volumetric efficiency from LS platforms. At 27.89 lbs, the manifold strikes a balance between material thickness for durability and weight management, important considerations for both naturally aspirated builds and boosted applications where thermal stability becomes paramount.

Installation is straightforward for builders familiar with LS engine architecture; the base manifold bolts directly to LS1, LS2, and LS6 cylinder heads using factory hardware, making it compatible with a wide range of stock and aftermarket configurations. This manifold serves as the anchor point for fuel rails, throttle body mounting, and accessory brackets, making it ideal for both traditional carbureted conversions and modern LS swaps requiring full EFI integration. Proper gasket sealing and torque specification are essential to prevent intake leakage, vacuum leaks, and coolant bypass issues that compromise performance and engine health.