A cracked head John and yes I had to take a deep breath before takling this one.
A mammoth task with new wet belts and all. Lots of complicated special timing tools and chats with mates who've done one.
Running sweet now, but I didn't use anything for 'block stability'.
A lot of these ecoboost will be written off before their time with head problems when maybe only 6 or 7 years old, due to the cost of repair.

Colin.