Coolant hoses under intake manifold

[Sr20probs]

Hey guys I'm currently routing my coolant hoses under the intake manifold. I'm trying somewhat simplify them but still have heat. I live in Massachusetts so I need it. What size do I need for the outlet on the back of the thermostat housing. I've read 3/4" but that's too small. That or im doing something wrong. I'm tired of spending money on stupid hoses then not fitting correctly. Please help me on this one I know it's stupid I feel like an idiot but a diagram with sizes would be sweet. Thanks

[jedi03]

I don't remember offhand but a set of calipers or tape measure should lead you in the right direction! Or google...it should be the same diameter as the chassis