Boring over an engine can provide for extra performance, as it allows more air and fuel to be drawn into the cylinders, resulting in a more powerful combustion cycle. However, it is important to note that boring over an engine can also reduce the engine's lifespan and durability, as it weakens the cylinder walls. Additionally, boring over an engine can require additional modifications such as larger pistons, connecting rods, and/or a different camshaft, which can further increase the cost and complexity of the project.
Therefore, it is important to carefully consider the pros and cons of boring over an engine before deciding whether or not to proceed with this modification.