SBC Alm Intake Manifold Eliminator Race

The AIR FLOW RESEARCH SBC Alm Intake Manifold Eliminator Race (MPN 4811) is a single-plane aluminum intake manifold engineered for small block Chevy engines demanding maximum flow capacity and aggressive top-end power delivery. Square bore design ensures compatibility with standard small block Chevy carburetor flanges, while the natural aluminum finish provides a clean appearance without sacrificing thermal management. This eliminator-style manifold prioritizes peak horsepower over idle quality and low-end response, making it the platform choice for dedicated race applications and high-revving performance builds.

Single-plane configuration delivers fuel mixture from a centralized plenum to all cylinders, reducing charge cooling losses and supporting consistent ignition timing across the entire rpm band. The result is a manifold optimized for sustained high-rpm operation where aggressive camshaft profiles and elevated compression ratios dominate. Aluminum construction minimizes weight while supporting the thermal demands of competition driving, where sustained engine loads generate extreme heat. The eliminator design—essentially a simple cast passage without internal divisions—maximizes flow area and reduces boundary layer separation, a critical factor when airflow velocities exceed 150 mph through the runner system.

This manifold is built for circle track racers, road course competitors, and engine builders targeting 5,500+ rpm peak torque and horsepower peaks. Small block Chevy platforms—whether naturally aspirated or boosted—benefit from the unrestricted flow path, especially when paired with ported cylinder heads and tuned exhaust systems. Weighing 20.2 lbs, the manifold adds minimal mass while delivering the volumetric efficiency required to support competitive power levels. AFR's engineering focus on flow dynamics makes this a standard reference point in race engine development, where intake manifold selection directly impacts lap times and engine responsiveness.