1971-1973 International 1110 5.7L V8. 1972-1973 International 1110 5.0L V8. 1972-1973 International 1110 6.4L V8. GENUINE NGK SPARK PLUGS . Plugs feature a fine-wire Iridium center electrode and Nickel-alloy ground electrodes for maximum engine horsepower and torque.