440 water pump question?

[750-h2]

I need a water pump plug like the one pictured [blue plug with 3/8 square hole]. Its for my 1970 440. Does anyone know the thread size? Also who sells them? Thanks

[Cuda Cody]

Check the year of your pump.  I think the hole sizes changed from year to year.  I know in 1970 they have different holes (if yours is an original 1970 pump housing).  You might be able to find a pipe plug that fits at Home Depot or Lowes.  You can also check your local auto parts store as they probably will have them too.

[anlauto]

Hard to find in hardware stores.

[750-h2]

Looks like the hole in my housing is about 3/4". I was hoping to find an OE style plug.

[JS29]

Hydraulic shop should have them.   

[RUNCHARGER]

Yup: Easy to find a plumbing plug in that size but they will have a square on top that a pipe wrench can grip to loosen or tighten.

[Brads70]

Looks like the hole in my housing is about 3/4". I was hoping to find an OE style plug.

I have one here in my junk drawer in my toolbook if you can't source one locally...

[750-h2]

Thanks Brad, I sent you a PM. Hardware store only has brass plugs that look totally incorrect. 

[Brads70]

Also used by various makes for the diff plug?

Just googled it and Dorman supplies them so any jobber should be able to get it....

https://www.amazon.com/Dorman-090-092-Pipe-Plug-Square/dp/B000DEM6CI

[Brads70]

Here is what I have, it's yours if you need it but check with your local jobber for the dorman ones as postage will likely be the same or more than a 5 pack of new ones? Let me know...?

[750-h2]

Thanks Brad, that looks like the right one. I just placed an order online from Napa for the 3/4" Dorman pipe plug. Looks good in their picture. Hope it works. Thanks again everyone for your help!

[RJChallenger]

That is a 1/2 " NPT or i/2" pipe plug. All jobber shops should have them.

[750-h2]

@RJChallenger. This is what I ordered, is it right?
https://www.napacanada.com/en/p/OES7041878

[tman]

If you ever need the whole kit, this is available.

https://www.ebay.com/p/CHRYSLER-Mopar-383-400-440-Pipe-Plug-Block-Kit/1150772422?iid=300321435354&chn=ps

[RJChallenger]

Yes , 750-H2 that is the correct size.