Assault Racing Products PC3025 Big Block Chevy Dual Plane High Rise Oval Port Polished Aluminum Intake 1500-6500 RPM BBC RPM Range: 1500 - 6500 Dual Plane High Rise Manifold Height: 5.22 in Oval Ports Dual carb bolt pattern for the spreadbore Quadrajet or squarebore Holley 4150/4160 style carburetors