personally i dont think they are unreliable engines what so ever. I think its all in how you treat your motor. I have never had a problem myself *knock on wood* and hell i know a countless number of people running daily drivers with 350-400hp, over 100,000k all on their stock bottom ends. Most of the here say about the 4g63 engine and its problems are mostly from people who havent taken the initiative to take care of their engine. Yes there is always CW and yes thats a major problem with the 7bolt motor, but you really cant prevent it. You either get it or you dont. Mitsubishi is to blame for that. The 4g63 is not a unreliable engine.