70 318 rear freeze plug passenger rear head blew out need install help.

[Mackman]

I have thought about the rubber plug but I thought it was only of temporary use? Like to get you home from a road trip one time? thoughts about a rubber plug for spring cruising? been a 2 year project, I would love to finally get a spring cruise out of her?

I would think it would be ok as permanent. Freeze plug block heaters are expandable rubber.

 

[1STMP]

I've done this on an old Jeep. I pulled up the carpet from the firewall and
drilled a 1" hole thru that lined up
the freeze plug. Got a rubber gasket
to cover up the hole once the freeze
plug was installed. Had a friend hold
new freeze plug in place while I tapped
it home from the inside while under
the dash.

 

[69Bee]

I would think it would be ok as permanent. Freeze plug block heaters are expandable rubber.

No, that is incorrect. Block heaters are made of steel, brass, or aluminum with a rubber O-Ring to seal it. The part that holds it in place is a back brace that expanded when the screw was tightened. They work like the drywall anchors that expand when the screw is tightened to retain it in the wall.

 

[YY1]

I've done this on an old Jeep. I pulled up the carpet from the firewall and
drilled a 1" hole thru that lined up
the freeze plug. Got a rubber gasket
to cover up the hole once the freeze
plug was installed. Had a friend hold
new freeze plug in place while I tapped
it home from the inside while under
the dash.

I've done that too.

Not proud of it.

 

[1STMP]

I've done that too.

Not proud of it.

Beats using those rubber plugs....