Volvo Penta TMD 30A - help please!!!!

Cylinder head problem

The problem is that it is cracked. There is a visble crack between the two valve holes in one of the combustion chambers. I suppose I could risk it but I would like to find a replacement head - but no-one seems to have one!
 
The experts tell me that it can't be welded or filled. I even asked if it could be ground out, but that isn't a possibility!!!
 
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