Well, based on what I have read on this forum, I bought some Autolite 85's to put in my 67 Chrysler 300 with 440 hi performance. Once I pulled a couple of the Champion J12YC plugs that were in the engine, I noticed the Champion plugs have a MUCH longer insulator nose that sticks into the combustion chamber. The electrode gap on the Autolites was right at the end of the threads without any "nose" that would place the business end of the plug a bit farther into the combustion chamber.

I wasn't sure I liked that, so I got some more Champions and installed them instead. Anyone want to discuss this...the Champions plugs have a longer nose that places the electrode gap farther into the chamber...ImPortant, or Not???