I’m well aware of the quench pad on the stock mag heads and the benefit of running the clearance down tight. Those heads are long gone and this engine now has open chamber W2 race heads on it. Chamber size and deck clearance has been carefully thought out to achieve my goals using the parts the stock bottom end of the magnum already has. I’m not looking for pistons because I’m using the stock piston, that’s what’s being discussed in this thread.