Checkout the leak from this cracked head
Cylinder heads when cold can hide the most obvious cracks and water leaks.
the link below will show you the normal cylinder head casting , but as soon as your head heats up and water pressure begins , the leak will occur.
watch and see
Just make sure your cylinder head reconditioner pressure testes your cylinder head hot and uses a hot pressures vessel to simulate water flow through the head. the wise the leak may not show