Went round to a mates who bought a cav gsi for £200
apparently had a recent engine exchange but had some problems
nice old mayo sludge everywhere, couple of flushes and it seemed better but would soon reappear.
Eventually thought feck it , off comes the head.
the engine had apparently been rebuilt recently. With no jubilee clips on any hoses and a bolt rammed into the vacuum hose to block a split lmao
once the head came off it was apparent, there was mayo everywhere and no3 was a lil bit cleaner than the rest, but not shiney by anyones standards.
then i realised the whole problem
the headgasket was fitted upsides down lmao allowing water/oil mixing
the block is definitely new as it still has numbers printed on the piston crowns and the head is shiney as anything, and the valves look mint.
so the lesson for the day is.. the word top doesnt mean bottom lol!