isuzu produced the4fb1 betwen1972-1987 aprox,im unsure of when they stoped producing parts to service the 1.8L diesel but im sure i cant find a head gasket for my engine.the 4th isuzu dealer i got pwaned off on told me the news so i need to find a solution.i looked up custom gasket makers on the web but i dont got a good history on sucessfull net vending and was hoping to get perhaps a push in the right direction .or maybe im goin about this wrong and maybe sombody out there might have some experiance with this sort of problem and can advise me.im really frustrated.