Are there two different size heater hoses? I know one of them is 3/4", but what size is the other one. The 3/4" hose goes from the heater core to the water pump. I don't know what size the other one is which also goes from the heater core to the intake manifold. Can anyone help me out. Much appreciate it.

The smaller of the two is 5/8".

I really appreciate the info. Been banging my head since there were no hoses on the engine at all.