Assault Racing Products PC2028 Small Block Chevy Dual Plane Vortec Satin Aluminum Intake 1500-6500 RPM SBC RPM Range: 1500 - 5500 Dual Plane Vortec 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