What engine has the cumbustion chamber mechined into the piston crown?

The engine with a combustion chamber machined into the piston crown is known as the "Hemi" engine, specifically referring to the hemispherical combustion chamber design. This design allows for better airflow and more efficient combustion, increasing power output and performance. It is commonly associated with certain models from manufacturers like Chrysler. Additionally, some modern high-performance engines also utilize similar designs for improved efficiency and power.