thanks for this answer! Well, I can say there is no crack around, the head seems on a visual range but I still did not run the test yet. I bought a 300€ petrol 1.2 twingo (famous french car) to replace the 240 , because I broke. And of course, the HG failed on this one too
I have to work on the little car before tackling the volvo again...
I do have another question : I think I remember one cannot have a head machined with more than 0.05mm of warpage. But some people told me ...that the machinist can "ignore" the manufacturer's recommandations and flatten the surface anyway. Would you agree? I looked for a second hand head and its simply impossible to find. a brand new head is above what I can afford to have my car back on the road again...