I too had the infamous cylinder head failure. I can tell you from experience that once you no longer have warranty, Chrysler will stick you with the bill ($3,000). I have tried to escalate my claim, including e-mails to the executives at Chrysler, only to be called by their customer service to tell me that there is no issue with the Pentastar cylinder head!
I have sent links to the news articles where Chrysler executives admit to the problem, and the call centre's response is that if there was a problem, a recall would have been issued.
I encourage all owners of the Pentastar engine who have had their cylinder head replaced to log a complaint with the NTSB at
www.safercar.gov
If there are enough complaints, an investigation will be launched and perhaps a recall issued to protect all owners in the future when their warranties expire.