I'll take a look when the head and intake manifolds are off, but it is a brand new Graf water pump. Before I put the motor in my car, I replaced the water pump. Is it possible that the extra pressure from combustion gasses can destroy a new water pump?

I've replaced almost everything on the motor (including resealing the oil pan and rear main seal+cover) except the cylinder head, head gasket, and upper/lower timing covers. So I'm hoping that this last area I didn't go over is my failure point.