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Compacted-graphite iron (CGI) has been promoted as the material of choice for diesel engines as popular alternatives to conventional gray cast iron. CGI has higher strength and elastic modulus than gray iron but retains the damping properties, thermal conductivity, and castability of gray iron. But for all the advantages of higher strength and wear resistance offered by CGI, it is precisely these properties that make it difficult to machine. Rotary-insert tooling is a patented boring tool that shows promise for reducing the machine horsepower needed for cylinder boring operations. Holes with large diameters are usually bored with boring heads having multiple inserts. The boring heads are used as alternatives to single point boring bars. The diameter of the boring head is equal to the finish diameter of the hole, and inserts are symmetrically distributed around the circumference of the boring head in order to provide force cancellations in the plane perpendicular to hole axis.