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Why would you want to put the o2 sensor in the highest heat location? If there is no exhaust leaks the o2 sensor is going to see the same amount of oxygen on down where there is less heat (hence longer o2 sensor life) that right at the motor. Not sure about something economical and naturally aspirated, but put a wideband too close to a turbine housing on a turbocharged car and you can kill a sensor in really short order. I.E. a few full throttle passes. Most wideband companies suggest the sensor be at least 16-18 inches away from the engine for heat releated reasons.
Ben
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