What plugs are You Running in Your 408 Strokers.
I've been an Autolite guy for decades, but I've gotten a number of the bogus Autolites in recent times...
Had issues with Champions years back, but they seem to be on the rebound now. I'm not used to their new numbering system yet...
People seem to love their NGKs, so I may be trying them next.
Don't even bring up E3s.