548chevelle

Does anybody have actual numbers on how much of a difference in horsepower the coolant temp makes? At what temp will the engine make the most power? I have a 160 thermostat and the fan set to come on at 192. Cruising the temp runs 180 but at the track by the time I go thru the staging lanes, burnout and up to the line the temp is at 192. If somebody proves that a lower temp will give me more power I'll get a circuit to turn the fan on at lower temp.