Coolant hole in 51 218 head needs sealed ?

[Don Dalton]

Can anyone tell me if I need to find a 1.25 diameter 1/8 or 3/16 freeze plug to seal this hole ? Is there a source to purchase ? Or is there a heater hose delete adaptor needed .

[Don Coatney]

Expansion plug.

[pontiacguy]

Yep, thats what it should look like. My freeze plug came in a freeze plug kit. I got it from Bernbaum. It was pretty reasonable. It installs with a ball peen hammer. I am pretty sure the procedure is outlined here on the forum. The service manual or a period Motors Manual will also have the installation procedure.