In 1982 GM used TTY bolts on there "new" diesel engine. Of course it was just a Olds engine made to run on diesel. Had head gasket problems! Imagine that!
I remember those cars well. Most problems didn't involve the engine itself......although they certainly did have their problems. The most I saw were transmission problems, because when the engines ran right, they had too much torque for the transmission and usually broke them. Diesel Grand Prixs used to be a dime a dozen because most were sittin in somebody's yard with a bad transmission.