Need some help 87 305 tpi. Deleted the heater core. I never took pictures of the coolant routing on the throttle body when I took the engine out. Now that it’s back in I’m trying to figure things out. I’m pretty sure on the front of the throttle body the nipple on the intake goes to the nipple on the throttle body. On the passenger side of the throttle body there’s two nipples. The bottom nipple is pressurized. Where do I run the bottom nipple to or where can I re-route?

 

The nipple on the side of the throttle body is an exit port and would've connected to the heater hose diverter valve. Without that valve, it would've supplied coolant directly to the heater core.

But without a heater core, heater hoses and that valve, best to simply remove the nipple from the front of the intake manifold and plug the manifold. That will eliminate coolant from flowing to the throttle body, eliminating the need for that exit port on the side of the throttle body. Bypassing the coolant flow through the throttle body is a common modification.

But if you're in a cold climate and want coolant to continue flowing through the throttle body, then that exit port needs to be routed directly to the radiator, to the return port beneath the radiator cap, where the return heater hose would've connected.

So that radiator port is another point of attention if deleting the coolant flow and will have to be capped. A rubber cap and clamp will be ok temporarily, but it isn't likely to hold up in the long run.