Single-plane, high-rise intakes designed to produce maximum power at higher rpm. Dart 220 single plane small block manifolds have a larger flange area to provide gasket seal when extensive porting is required. Carburetor pads are specifically designed for 4150 & 4500 carbs. Extended runner dividers equalize port length and are radiused to equalize cylinder-to cylinder fuel distribution. Optimized runner cross-sectional area maintains high mixture velocity for maximum torque. Angled runners turn the airfuel mixture smoothly from carburetor to ports. Dual distributor hold-downs simplify timing adjustments. Manifold flanges are scalloped to clear center water outlets, and bosses for rear coolant lines are provided. Raised water cross-over and air gap insulate the intake charge from engine heat. Integral bosses for nitrous injectors.