I bought this truck wrecked in a aution, it have 90k. the accident was on front, it could be any possibility that the time could jumped and only bend 2 valves or all 4 valves in these 2cylinders? It seems to me very rarer that this truck with only 90k have a bad engine when I have heard that Cadillac makes extraordinary northstar engines. Does any one know what could happened over here? Or any solution?