X usually go around $200 bare and around $300 to $400 needing a rebuild. Maybe around $800 to 1k if they have been rebuilt and you can see receipts or talk to the machinist. If you don't need the X get a set of 1.88 J's 915 heads and install the 2.02 this way the valve sits nice and high unlike a lot of original 2.02 heads that are on there 4th valve job!