Assault Racing Products PC2026BK Small Block Chevy Dual Plane Air Gap Black Aluminum Intake 1500-6500 RPM SBC RPM Range: 1500 - 5500 Dual Plane Air Gap Manifold Height: 4.65 in Square bore carb bolt pattern for the Holley 4150/4160 style carburetor Open air gap under plenum for cooler fuel charge