I don't know for sure,but I wouldn't think so.They are supposed to be the best you cab get,right?The only thing different from race gas is the lack of lead,basically.If it were me I would run them and not worry about it.To be honest,my next set of valves were gonna be Ti, and it was gonna be a pump gas motor until I eased up to alky.So I was planning on doing it myself.I would like to see what a pro would have to say on this.