Hello I have a 1980 intruder 440 I put in a new primer today, when I bought it the mice or squirells made a nasty nest in the fan housing and thier urine ate away a bit of ghe outside edge of the pto cylinder exhaust side, well when I took the heads off I realized there were no head gaskets! The cylinders and pistons look very good what is the idea behind having no head gaskets? I'm stumped I did clean all the corroded aluminum off the fins and there's great airflow now hmmm? I suppose I better get some gaskets.