Thank you for your help, I am new to this site and diesels in general. My work truck began leaking coolant between the head and block behind the thermostat housing. A local shop says this is common. I've replaced many heads on various engines. Head gaskets are plentiful and all manufacturer's recommend replacing the head bolts, however I have not found a source for these bolts for this particular engine. I would appreciate any recommendations for head gasket and the bolts. I have tried searching using the words head gasket and bolts, but no results found.