ALUM18 BC PRO1 ASSM.2.40

Dart Big Chief Cylinder Heads have dominated in sportsman classes since their introduction, and they have continued to improve the design with the latest Pro Stock technology. With their sophisticated CNC machining programs, they can tailor a pair of Big Chief heads to fit your exact engine combination. These 18 degree heads have what it takes to win, spread intake ports, shallow valve angles, efficient combustion chambers, raised exhaust runners, and a valvetrain that's reliable at high rpm. Huge 421cc intake runners maximize flow. These heads have as cast runners with CNC machined chambers and CNC blended bowls. Must use specific pistons, intake, and shaft rockers. Assemblies include 2.400"/1.900" stainless steel valves, 1.625" Vasco Jet springs, titanium retainers, and are ready to install.