Hello. Have a Volvo C70 2.0T 120Kw, which now has an engine damage. The 5th cylinder has no compression any more. Since the car has already 220tkm, I do not want to have the repair done in the workshop. At the moment a defective valve is suspected. Have still a similar engine lying around and would only want to change heads. Can someone give me a detailed instruction for this? Thanks Greeting Torsten