Looks like the experts we all right!

 

Im fairly new to the internals...where's it blown?

 

hi mate, it's not blown as such the cylinder head has lifted and stretched the head bolts, the gases then escape into the waterway over the top and underneath the gasket, if you look at the top right head gasket you can see a burn mark near the water jacket area(outside the centre area of the gasket)
maybe someone else can give a better explanation!?

 

Makes sense Thanks