Ok, here are some pics of the damage ..
Both the rear cylinders were wet when I took the head off .. you can basically see they wern't combusting while the other cylinders had a nice dull black look ..
The screws made some nasty damage on the piston tops and the cylinder head .. although I have seen worse, this is not too good at all.
In the third picture you will see where I marked in red circles, the screw hit on the sides of the piston and cylinder ..
I am just waiting for our engineer to come out and look at the damage .. one of the valves look like it is not seating properly but I want them to check it to make sure ..
Also, I did not find any screws in the cylinders so that means the screws have gone through the turbo :/ ! so turbo will have to be stripped and checked also.
Barkie, I will give you a call shortly to discuss.