Quote:
Originally Posted by PontiacJim1959
They are called "freeze plugs." Welch plugs are the flat style found in the older 1930's - 1940's blocks having a non-pressurized coolant system.
I thought you knew better than that. LOL
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Sorry dude .you be wrong LOL
Welch plugs are named for the hole that is left in the casting or the "welch" of casting where the sand core is supported to cast said engine block. Then they bore the hole to a specific size and fit it with a plug.It fills the "welch" in the casting.
They also are used to block the end of a intersecting passage, say like in a carburetor where fuel passes from one channel to the next
Not much fuel freezing ,even where I live.
They do tend to pop out sometimes when an engine block freezes, but wont protect it ,like some people commonly Believe. Probably why some folks call them freeze plugs. They do not protect the block from damage of frozen coolant, water....But you can call the freeze plugs if you want.
Freeze plug is a common misnomer that is all.
I am sure I will catch some slack for this info. Call me old school.
Fire away.
Straight from McMaster Carr...
https://www.mcmaster.com/welch-plugs/