Cracked Head?

So the mystery continues..............

Put pressure into the radiator until the hose were taught and left it there for half an hour. Came back and the pressure tester gauge has exactly the same reading. I turned the crank to a few different settings to see if the valve or piston positions would reveal a crack but no change in pressure.

I did put a new water pump in when replacing the timing chain. The new pump had an extra outlet but came with plugs. I put the hoses back to the same configuration as the last pump and plugged the extra (see picture).