Single Pattern vs Dual Pattern Camshaft

Ground that way for a head that has less than idea flow characteristics and stock exhaust manifolds. Usually ground with more lift and duration on the exhaust lobe to help scavenge exhaust out of the cylinder and pull more fresh charge into the cylinder. Stock heads are production pieces and are usually not at their optimum flow potential and stock mopar exhaust manifolds are not the greatest with the restrictions especially on the drivers side the way it has to get around the steering shaft especially in an a body.