How do replace a freeze plug on a Chevy 350?

First off, this is a dirty greasy job if done with the engine in the vehicle. But basically all you need to do is jack up the car,(use jack stands),high enough so you can move around under it. You may have to remove exhaust components depending on which freeze plug you have to replace. These things are made of soft aluminum. Just take a sharp drift and hammer it into the middle of the plug then pry it out. Make sure you have drained the coolant first! Clean the hole with a piece of sand paper to remove any corrosion and then grease up a new one and tap it in till it seats.