This modification package increases the displacement of an engine, typically a Jeep 4.0L inline-six, to approximately 4.7 liters. It achieves this through a combination of a crankshaft with a longer stroke, connecting rods of appropriate length, and sometimes, modified pistons. The resulting larger displacement yields a greater volume of air and fuel that can be combusted, leading to enhanced power output.
The primary advantages of such an upgrade are increased torque and horsepower, particularly at lower engine speeds. This translates to improved acceleration, enhanced towing capacity, and better performance in off-road conditions. The historical context reveals its origins in the pursuit of greater engine efficiency and performance enhancements within the automotive aftermarket.