freeze plug

thumbanger · Jan 25, 2010

Does anyone know the freeze plug size in Super C 123 engine. Thanks for any help

Bob · Jan 25, 2010

Which one(s)?

The plug at the rear of the camshaft is 1-5/8".

The water jacket plug at the rear of the block is 2" (172592, replaced by 63556R1).

Can't remember if there's any others???

thumbanger · Jan 25, 2010

There is not but one freeze plug as cam plug dont freeze.

Bob · Jan 25, 2010

I know a few people (BLEMS) who probably COULD get the cam plug to freeze!

I commented the way I did 'cause there are a few variations of the head, etc. and I wanted to CMA just in case there's another plug somewhere in some versions of the block/head!

jbp · Jan 25, 2010

They are not for freeze protection at all. They are holes to facilitate removal of core sand from head and block castings. They are called welch plugs.
Joe

jim a. · Jan 25, 2010

Freeze plug for a c123 motor is 2inch just put one in last week. go to napa and ask for it real cheap

Bob · Jan 25, 2010

lbp,

Call 'em what you want, the official name in the IH C-123 partsbook is "expansion plug".

freeze plug

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