Coolant flow direction

OK, this seems like a dumb question and I'm pretty sure I know the answer but I want to double check.

Anyone know FOR SURE which way the coolant flows through the cooling system? The easy way to answer is in reference to the external spigot/pipe on the water pump... i.e. does the coolant flow INTO this pipe or OUT OF this pipe?

I think it's time to design a new, larger capacity radiator for my CRF450 powered roadracer and I just want to make sure I have a design that will work!

(also, anyone know any good custom radiator fabricators?)

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