Sorry i don t know the exact location but i think mine is on the passenger side bottom of course.
C4 corvette radiator drain plug location.
Crawl under the right front side of the radiator and locate the drain plug.
Open the air bleeder screws located at the water pump and.
The only drain plug in town is located at the base of the radiator.
Be carefull with the inside thread of the radiator and have another petcock from the part store on hand when you do it.
Place a drain pan under the drain plug and then turn the radiator drain plug.
Open the hood and remove the radiator surge tank cap located next to the radiator for venting.
Learn how to change the coolant in your c4 corvette.
I have read on similar thread before that there is a risk that the petcock will get damaged when you remove it.
In this case i opted to insta.
It will be facing the engine.
This is the time to consider upgrades.