Abstract: The lost foam method of casting a cylinder liner with water jacket comprises the steps of creating a blank identical to the liner desired, with a drain defined therein, from a heat-dissipated material such as styrofoam, coating the blank with core wash, placing the blank into a casting mold, filling the mold and a chamber defined within the blank with sand, pouring hot metal into the mold, extracting the formed metal liner from the mold, draining sand from within the chamber and plugging the sand drain.