Ironhead Sportsters, like your 1980 1000cc model, are notorious for overheating. Oil coolers work by providing additional oil in your system and an additional surface from which heat can radiate. Almost any oil cooler will work on an Ironhead engine as long as you understand the oil line routing on the motorcycle. In a 1980 Sportster with an after-market inline, as well as a drop-in, oil filter,
