I am in desperate need of the coolant pipe that runs from the intake to the throttle body. Part number is 25533986. Has been discontinued for some years through GM.

 

Did some searching with the part number. Here's an interesting thread. One of the posters mentions that he tapped the throttle body to install pipe plugs. Might also work to tap either side and install hose barbs. Good luck!👍

https://forums.aaca.org/topic/176699...-with-tb-pipe/