Some people think they should only be used once I’m in the process of rebuilding my engine and was wondering what other peoples thoughts are on this. I rebuilt an engine 30+ years ago with help from my dad how was an aircraft mechanic he never mentioned that was what should be done. I can see it if you are racing but for street I’ve read about them stretching ect Also read some of the aftermarket one aren’t as good as the originals Haynes manual doesn’t mention it. So has any body had problems with reusing them?