A modification package designed to increase the displacement of the Jeep 4.0 liter inline-six engine. This typically involves replacing the crankshaft, connecting rods, and pistons with components that have a longer stroke, effectively increasing the engine’s bore and/or stroke dimensions. The objective is to enhance the engine’s low-end torque and overall power output.
The appeal lies in the potential for significant performance gains without resorting to more complex and costly engine swaps. It offers a balance between affordability and improved driving experience, particularly beneficial for off-road applications where low-end torque is crucial. The concept has evolved over time, with various manufacturers and builders offering different configurations and component choices, catering to diverse performance goals and budgets.