Im not sure? LOL, is this one? maybe its just a tube of JB weld?

this picture is of my latest flathead purchase looks like it had a drain plug? at one time and they filled it in when it was rebuilt??

maybe the price will be much less if you dont order the freeze plugs?
I actually talked to the owner (he's local) about rebuilding my flathead but he's never done one before so I got scared off! hmmm

Josh