As I have indicated on previous posts, I am building an all new engine for my 1990 RX-7. I am using two rear turbo housings, (T2), in this build, so I need to do something about those coolant holes. Of course, I purchased two rotor housing-to-intake manifold freeze plugs that are intended to close off those passages. Can anyone advise me on the best way to install these freeze plugs? I have installed freeze plugs in the past on a cast iron engine block and cylinder head, but considering that the rotor housing is made of aluminum, I am concerned that driving the freeze plug in with an appropriate-sized socket and hammer may deform the housing. According to Mazdatrix, these holes are 19.5 mm in diameter, while the freeze plugs are 20.5 mm in diameter; As a result, I am expecting some force to be required.

As an alternative, would it be advisable to fill these coolant holes with epoxy such as JB weld instead?