Re: {Chrysler 300} 300C 392 block plug size

["'dave mason' via Chrysler 300 Club International" <chrysler-300-club-international@xxxxxxxxxxxxxxxx>]

Maybe this process will help someone. YMMV but I’ve been installing brass freeze plugs (413 wedge, also 383 and 361 I believe are all 1-5/8”), by using a hefty 3/4 drive 1” socket to get the freeze plug started straight.  This is for installing concave. You can use something hefty that fits down in the concave of the freeze plug fully (picture 1).   A center hit might work if installing convex.   I always install concave like originals seem to be.  

Using the socket (or similar tool) to tap takes patience and requires you to just barely get it started straight in then use a brass drift to gently tap it in real slowly going around opposite sides of the outer edge  as you do it (picture 2).  Once started good you can increase tap force.  A lot easier with engine out than trying to do it laying on the ground holding heavy tools up.  But done it both ways.  

Not familiar with the hot heads ones.  

Dave

Sent from my iPhone

On Jul 17, 2025, at 13:58, John Grady <jkg@xxxxxxxxxxxxxxxxx> wrote:



even better , hot hot heads has machined ones with a step held by a SS bolt into a T bar arrangement, like a flybolt anchor . Has O ring 

Today’s mechanics do not know how to set those .Has to be hit  dead center just hard enough, ball peen hammer , (which hit is pretty hard ) if not set they fall right out  

Happened to me twice  , especially the smaller ones in head , very first run , 2 miles from home . Much mayhem ensued . 

On Jul 17, 2025, at 12:14 PM, Ray Jones <1970hurst@xxxxxxxxx> wrote:



IDK. But, whichever size, install Marine Brass plugs. They won't rot like steel ones.

On Wed, Jul 16, 2025 at 11:36 PM 'leslie miklas' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:

Can anyone tell me offhand the correct size of 300C 392 block plugs ?

1-5/8" ? , 1-41/64" ?

 

Thanks

Jeff Miklas

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