I need to do it to clear the 4" intake pipe.any one know what size NPT plug to use? will 1/8 do?and is a gasket or "o"ring I need to change between the pipe and the water pump?
any tips of doing it, or speical care need?Thanks,Stephen
Once you get the metal inserts pulled out of the neck you can run a 1/8 NPT tap in there. It's tight, and with flush-head plugs they will actually be a little sunk in to the holes. But they should seal up just fine.
There is an o-ring on the pipe coming up from the water pump, and a gasket between the neck and the head. May as well replace them while you're in there.