Hey guys, any idea why three of my plugs, two passenger side and one driver side would have the electrodes burned down like this after 50k miles? Plugs were all OEM, I’m the second owner, never checked the plugs before as the car was under warranty and dealer serviced. 2015 Camaro SS, LS3. No mods besides NOWEEDS that I added maybe 5k miles ago. Found this while adding long tubes to the car. Replaced all plugs with new AC Delco’s.



Good plug

Bad plug

 

maybe step down a heat range.

might get the PE A/F and timing checked with your tune, if you are not the first owner.

 

We don’t think that’s cause for alarm with the miles and limited mods. The water jackets don’t remove heat at the same rate over all 8 cylinders, so you will see differences. The cooler heat range plugs are a solid plan of attack.