In the hunt for better engine performance, porting is a common method. The process removes material in critical areas to allow more air and fuel to flow through an engine. More air and fuel means better combustion and more power. But how do you accurately port complex interior shapes? Extrude honing.
This is a companion discussion topic for the original entry at https://www.hagerty.com/articles-videos/articles/2019/01/21/how-extrude-honing-works