Ok fair enough opinion,

So you're telling me that Ford have produced an identical capacity 1.6 cvh engine but have cut different valve seat angles in? Like I said the mating faces were unmarked and when i popped the valves in it fit perfectly. I used the same spring and collet and retainer as was fit before.

As for the headgasket why not use it again if, which i didn't tell you i know, it had been on for 14 days but ran for only prob 100 secs? ie it came straight off and was still like new.

Any more ideas?