Assault Racing Products PC2021 Small Block Chevy Dual Plane High Rise Satin Aluminum Intake 1500-6500 RPM SBC RPM Range: 1500 - 5500 Dual Plane High Rise Manifold Height: 4.65 in Square bore carb bolt pattern for the Holley 4150/4160 style carburetor Does not have provision for exhaust heated choke