Autolite Iridium....no problems with them...like I said, just a SMALL hint of a spit at the end of the track with the wider gap....stuck 104's back in for now set at .028....have to get back to track now.....I've been a tech to long to remember..but, one thing I do know. If it ran fine before I touched it and now it doesn't.... I screwed something up!!! Side note ,is that a Bosch platinum??? I've had nothing but bad luck with those. Glad you found it!! Phil.