Steve Favia
Well-Known Member
I would think you could use any of the freeze plugs right? Block heater would probably be better than oil pan heater like Delmer said.
Well, technically they are expansion plugs. Those holes that they are in, are cast in the block when the mold is filled with molten metal.
Their purpose is to get the sand out of casting when it has cooled.
The skirt of the plugs are expanded so they fit tightly when driven into the holes.
I have seen blocks that cracked from the coolant freezing and rarely do the expansion (freeze) plugs pop out to prevent acrack in the water jacket.