Bumping this topic back up...
When I bought my BX, I bought another one for spares, which belonged to a very good family friend. His cylinder head cracked, and so he bought a brand new shell (at a cost of over £750), had new valves installed and he fitted his second-hand cam and injectors to it.
While testing the engine on the road, to set the turbo up (as he had a new one fitted as well), the octopus pipe failed, and so, deciding he had had enough, he sold me the car for spares. I took the head off and have stored it for the past 7 years.
So, there you have it, a almost new cylinder head that has covered around 70 miles.
What's it worth? £100?
R