This aftermarket modification refers to a collection of components designed to increase the internal cylinder diameter of an engine to 124 cubic inches. This typically involves replacing the existing cylinders, pistons, and sometimes the cylinder heads with larger-sized counterparts. A common application is enhancing the displacement of smaller engines to achieve greater power output.
The primary advantage of this upgrade is a noticeable improvement in torque and horsepower across the engine’s RPM range. This leads to quicker acceleration and enhanced overall performance. Historically, such modifications have been popular among enthusiasts seeking to extract more performance from their vehicles without undertaking extensive engine swaps or forced induction methods.