..Evidently the head bolts stretched in the Olds 350 Diesel causing a lot if not all the head gasket problems...by the time GM fixed the problem the public had had enough so it became history...But....The bottom end is almost bullet proof and has a lot of potential....I am in the midst of using the parts from a 403 Olds engine to build a gas 350 out of the diesel...Makes a great truck engine.....or whatever......