You need to read a bit slower and think a bit longer..... I said you need the torque plate to block the water galleries off so the water can circulate. And can you please tell me how much "flexing" in the shape of a barrel occurs when you add cylinder pressure,heat,moon cycle,wind direction and any other factors? Dont say it depends, lets use 2Bar boost on a engine with 9:1 comp, 9000 rpm, 87mm bore, 77mm stroke,30 deg timing as an example. Just an estimate is ok coz obviously there are other factors.. Im just curious