AFR Big Block Chevy Magnum 18 Degree 457cc Race Aluminum Cylinder Heads

AFR Magnum 18 Degree 457 cc Big Block Chevy heads are the highest flowing head offering from AFR for Big Block Chevy engines. By having the intake ports raised .500 in. along with the combination of moving the valves to 18 degrees, Magnum 18 degree cylinder head will flow a whopping 498 cfm of air through the intake ports at 1.000 in. lift. Designed for 540 ci and larger racing engines, AFR offers Magnum 18 degree fully assembled, bare CNC ported, and bare unported casting for custom port work.