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Click on image for the lowdown. 
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The LT1 water pump has these hookups:
Thermostat housing on the top, that goes to the upper port on the radiator.
Lower radiator port to the other large hose (near the top, pointing toward the front/driver side)
The smaller hose nipple that comes out the upper side and turns up went to the throttle body and can be capped off.
The other two smaller hose nipples go to the heater core, orientation is not critical. Ideally you want the outlet from the water pump to go to the top of the heater core, but either way will work and techline doesn't specify a flow direction there. | | |
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