The Mahle top ends are still in production and easily obtained. Not cheaply, but easily. The problem is likely with the cranks. If the previous supply ran out then new would have to be made and it takes awhile for the Chinese to make a halfway decent crank.

Dan,

Thanks for the offer of purchase but I don't want to sell one of the best engines I have ever made. It would not go low on the sales amount even if I did, which would scare away most people.