when the car was being driven in extreme conditions he would overfill by a quart for one reason. The excessive forces of the car moving in directions with higher G forces tended to make the oil slosh around in the pan and would sometimes leave air to be pumped through the oil pump. If I recall in John (houston)'s case, he felt that this action lead him to spinning a bearing since essentially the bearings had oil starvation at extreme conditions. Sound very palusible to me and if I were in taht situation I would take that advice.
Z is back and running!!!! If it's not one thing it's another!!