One of the big misnomers with core plugs or " freeze plugs" is that they are intended to act as a sacrificial piece if the coolant freezes. However, that's not actually true. They are simply there to plug holes that allow sand to be removed after the block is cast. Brass freeze plugs are a little more resistant to rust, and as a bonus look better, but if the coolant is taken care of both can last a long time in an engine! #enginepowertv #engine #enginepower #smallblock #engines #enginebuilding #