heli coil help

i stripped the header threads on my edelbrock head.we tried and tried,but finally just removed the helicoil and put a steel bolt with antiseize in.what ill effects will this have in the future?will it back out?or will i not be able to get it out again?i know i should have pulled the head and had it fixed right with a new helicoil,will the steel bolt in the aluminum head be an issue?