Extruded cylinder liner

An engine block, comprising:

• a body including a first material;
• at least two cast-in cylinder liners including a second material metallurgically bonded to the body, the cylinder liners each including a plurality of spaced apart projections protruding from an outer surface thereof and extending in a direction oblique to a longitudinal axis of the liner, and channels defined between adjacent ones of the projections, wherein the first and second cylinder liners are arranged in the body such that one of the projections of the first cylinder liner is aligned with one of the channels of the second cylinder liner;
• and
• the first material surrounding and extending between the features.

A method comprising:

• extruding a metal material through a die to form a cylindrical body defining an inner surface, and an outer surface having spaced apart protruding features;
• rotating the die about a longitudinal axis during the extruding step such that the features have a rifled pattern;
• sectioning the cylindrical body into cylinder liners;
• and
• applying a wear-resistant coating to the inner surface after the extruding and rotating steps and prior to the sectioning step.