My choice is the 3VZE 3.0L V6 by Toyota. They eat head gaskets like they are as cheap as gas, which the engine vaporizes even quicker. My guess at why they eat head gaskets, is the idiotic exhaust collector design. Instead of collecting the exhaust below the engine, the collector is at the center of the back of the engine where the aluminum heads and iron block meet. It also was designed for trucks, so why did they design the power to come at such high RPM's.
What do you think that title goes to?