I'm replacing freeze plugs in a non performance 318, they'll be the usual brass or bronze or whatever they are now.

what if any sealant should I put on them? some sort of locktite? which one?

Ole' Ugly, my 1985 Gran Fury. Luke, my 39,000 mile 77 New Yorker, Darth, my 50,000 mile 60 New Yorker.