jthorn9

OK, I have no idea what the name of the part is, but I found my problem. When I was working with the head today, the passenger head is missing the cap that covers the radiator port at the back of the head. It's that little circular cap. What is its name exactly, where can I get one, and exactly how do I fix it, like does it weld in place or what?

86 5.0L

expansion plug? is it on the head or below it on the block?

jthorn9

On the head, there are two on each head, one in the front, one in the back, it's that little 2" or so round cap that seals off the water ports.

AdderMk2

its a freeze plug. its there to keep the heads from cracking if the coolant freezes. just measure the hole, get another plug, and install it just like you would a regular expansion plug in the block

projectresto83

I take it your problem was antifreeze went everywhere then?

mjr46

NEVER SEEN the freeze plug on a head blow out.....

projectresto83

Its not fun when it does lol.

86 5.0L

make sure its the exact size, I needed a 1 and 1/2" plug, the bitch behind the counter gave me 1 and 31/62" and it was not close enough

jthorn9

I got it already, just got to put it in, due to bad weather and Xmas, havn't had time to. But yea, fluid went all over the place, made one hell of a mess. My timing chain cover blew a leak at the water jacket, so I got to take that off, but getting the crank pulley bolt to break is a pain, but it's going.

greenstreak9205

were you just running water or a bad mix or something? kinda curious as to why it blew out