1971 International 1210 Spark Plug, International 1210 replacement Spark Plug by NGK, Spark Plug compatible with G-Power Spark Plug;Gap 0.030; 3.8L L6 OHV International engines in the 1971 1210. 6 recommended per vehicle. NGK 2763 Spark Plug is categorized under Secondary Ignition within Ignition, identified by 087295127636.