I pulled these off my truck over the weekend and replaced them with some Iskys...and boy those Iskys sure have some rough edges where its going to be making contact with the pr..anyone else notice that??

Anyway, these are worn but not too bad for 139k miles..they were the originals on the LT4 when I bought it with 66k miles and I've used them an additional 73k miles..on almost each of them, one side is hardly worn while the other side is.
Just thought I'd share and see if anyone thought these were crazy worn.

 

Those look similar to my GMPPs after 8K miles.
I went with TFS this time around.

 

Those look like mine did after 8K miles or so too. Is a valve spacing thing so which heads they are used on is the primary factor.