A modification package designed to increase the displacement of a Harley-Davidson motorcycle engine to 107 cubic inches. This typically involves replacing the cylinders and pistons with larger-diameter components.
Increasing engine displacement generally leads to enhanced horsepower and torque. This results in improved acceleration and overall performance, particularly noticeable during passing maneuvers and when carrying heavy loads. The practice of increasing engine size has roots in motorsports and performance enhancement, becoming increasingly accessible to motorcycle enthusiasts seeking greater power.