I pulled the heads off my sons 2011 charger 5.7 ex police car last weekend. I was afraid with 100K it would eat a lifter. I am putting a 6.4 cam in it and related parts. What wears in these things? I was shocked at how clean it is inside, the car was well taken care of I know the department and the chief where the car cam from but jeez this thing looks really good inside for 100K. I can still see the cross hatch in the bores! I checked a couple guides and they are all good, I don't have both heads apart but I think they could be washed up seals replaced and the new springs put on a good. What has everyone elses experience been with these other then valve seats?