Just been given the diagnosis - predictably the worst case scenario
Unfortunately I havent't very good news ...
We made a diagnosis of your engine.
The cylinder 4 is out of order ago - 4 bars while the compression cylinder 1,2,3,5 and 6 are about 10.5 bars
We also saw that there is a major sticking point on a position of the crankshaft, which means that the engine block was also damaged. The compressor valves present traces of oxidation due to the presence of water which we attribute to a passage of water between the cooling and combustion chambers.
So £3k's worth of reman powerhead it is then...