Dart Big Chief Box Ram intake manifolds are like custom-made without the time or expense. These castings incorporate Dart's Big Chief radical spread port design for phenomenal airflow, an optimized runner cross-section area to maintain high-mixture velocity for maximum power, and carburetor pads specifically designed for 4150 and 4500 carburetors. The manifolds' individual runners provide a line-of-sight path from carburetor to ports, and bosses for rear coolant lines are provided, as well as dual-distributor hold-downs to help simplify your timing adjustments. For all of the benefits without the hassle, top your engine with Dart Big Chief box ram intake manifolds.