freeze plug issues

[68black_betty]

a few weeks ago, i blew out a freeze plug goin down the road, i replaced it with one of those neoprene ones that expand when you tighten them jujst yesterday i blew that one out goin down the highway, now with that being said, before the first one blew out about a week ago my thermostat it was a 190, so i replaced it with a 200, it was either 160 or 200, what im thinkin is would it be possible that with the engine running only ten degrees hotter could expand it that much more to blow out a freeze plug, i checked the other ones and they havent budged at all, or are those neoprene ones just a pos, and does anybody have a tip on how to keep them in, a buddy told me to get one of the steel ones and put some locktite around it

[cdowns]

those neopreme ones are notorious for being bad like that
i've alyays used the proper sized metal ones drove them in and trouble free for many years

[Longhorn Man]

I've always used brass if I could get them. They don't rust like the steel ones.

[68black_betty]

yeah i know, the other plugs are those steel ones but findong one in the size i need is ridiculous, everyone has 1 5/8 but i need like a 1 7/8

[Autoblueprint]

The rubber plugs are designed for temporary use.

Brass expansion plugs are what you want.

Dorman should have the size you need but be ready to do a bit of searching:

http://www.dormanproducts.com/c-250-...ion-plugs.aspx

[cdowns]

NAPA has em all

https://www.napaonline.com/Catalog/Result.aspx

[Maxxd07]

Brass or steel, I have used both with good luck. Make sure the hole is cleaned up with some emmery cloth or sand paper as well as a light scuff on the plug. Use the green loctite on the plug and drive it in with a socket that fits just inside the "lip". Let it cure and it should hold. Personally I have never had a problem doing it this way.