Originally Posted by
dan_vector
If you take off the head is the piston surface and underhead clean and not pitted? If it is then the engine is not lean.
You can try going back to the 2016 piston/sleeve but I would not be overly concerned if the engine is running well and you have plenty of smoke out of the corners and it isn't blowing plugs then the engine is not too lean.
use someone elses temp gun to double check 370 is way too much I don't believe at 370 u are seeing smoke and no nova plug will withstand 370. maybe u would get away with 370 on a os plug but deff.. not nova!!!
again double check with another temp gun....