Originally Posted by krooser
400's have three freeze plugs per side... as was mentioned the stock dampner is different than a 350.
Most all 4-Bolt 400's have 3-Freeze Plugs.
2-Bolt Main 400's have 2-Freeze Plugs.
I have one 4-Bolt 400 that has the 3rd-Boss but, no Hole/Plug in the center Boss. An oddball.
400 Block Info:
400 Balancer ID:
machined out section.