Brad, I've searched and read quite a few plug threads here, but I've yet to see a confirmed mechanical reason why precious metal plugs aren't compatible with our hemi. I'm not saying they're compatible or making it an issue of argument. I'm just wanting to know what the reason is. I may have missed the thread where the issue was confirmed...maybe even by Dodge. I've seen some threads where some claimed the precious metal plugs gave them operational issues. Again, not arguing against that. But why exactly?It was probably for the best. The Hemi doesn't really like anything but the factory copper type plugs.