Hello yall,
I have a 79 f150 with a 400 that I had rebuilt. I have run it several times getting all the leaks and timing worked out, and now I have one last leak. It comes from a hole in the front passenger side of the block behind the alternator. Problem is, I can't find the plug that goes there online or at the parts store. It appears to be a freeze plug as there are no threads.



Thanks

 

Tap and plug it?

 

Or measure it and look online for a freeze plug the right size? (e.g. 1/2", etc.)

BTW, that's in the head, not the block (in case you were searching for "block freeze plug" or something).

 

Thank yall for the replies.

 

Mine leaked exhaust from that hole...are we certain coolant should even be there?

BTW I used a steel 1/2" block plug from AAP.

 

I'm not sure...I think so though it leaks smoke at first then when the thermostat kicks it shoots coolant out.

 

i looked at mine, it is a freeze plug. I was reading some things on the internet, some people had that issue. the freeze plug fell out because their head was cracked.