Do not buy anything from Adsit that has any type of warranty...........because you will not get it.

This is the place to buy the long block for less than $5K:
http://www.mercedesengines.net/products.asp?cat=40

You can also send your head to them for new valves and prechambers and springs. Total cost will be about $1500.

You'll have to chip in about $800..............DO IT!!