Here is one of our Victor-Glidden heads sitting on the machine ready to get ported. The base in which the head is sitting on moves in five different ways, which enables the cutting tool to do its job. The cutting tool moves up and down while the head rotates. Writing a CNC program takes a lot of time. However, once the program is written, it saves a lot of time. That helps head porting businesses accomplish their jobs quicker. It is an accurate way of providing the same cut not only for all eight ports, but also for all cylinder heads that are run through the machine.