I believe that the plugs that are shaped like a cup, go into holes that have no ridge. That is to say that if you drive it in it will simply end up in the water jacket. The way to remove these is to use a dull chisel and drive it on the side to turn the frost plug. Then you grab it with pliers and pull it out.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!