Second dyno run with a little mapping done as it was running rich (new lambda) made more power at same sort of boost (1.7 BAR).

Then the head lifted (hence why the revs stop as Lee stopped it.)

There seems to be a few Zetecs that have similar problems at this kind of power figure... Lee is skimming the head as he thinks it may have very slightly warped after he last took it off to develop a new cam, and didn't skim it when he replaced it.

It will be back together, possibly fitted with M12 stud and nut kit and more boost for tomorrow or Thursday with luck. I'll keep this post updated...