440 freeze plug question

[dan juhasz]

Customer of mine had a rotted core plug in his 440. He gave me shallow brass 1 5/8 plugs. Had a little bit of an issue getting it in (headers) but I thought it was good. Came out the next day and had some coolant in the drip tray. Barely leaks but it leaks. Removed it , when out and bought a steel deep ( 1/2 inch ) Dorman (aka China) and went to install and it also just slide into the block ? Checked the part number on the bag and it is indeed an 1 5/8. Only seemed to tighten up when the last 1/8 inch or so at the edge hammered in. Really don't trust it. Never experienced this before. Are deep plugs on a 440 a no no, or do I just need a different manufacturer freeze plug? I only put water in at the moment and was going to pressure check tomorrow. Thoughts?

 

[DanielSlocum]

get milodon deep brass. use the right stuff silicone. problem solved.

 

[ckessel]

Correct Mopar size is 1 41/64".

 

[dan juhasz]

Correct Mopar size is 1 41/64".

are they available?

 

[pnora]

Better get the right size plug. If it blows out it could be a overheating disaster.

 

[pnora]

are they available?

555-068​

 

[ckessel]

Most places push the Chevy size on you. You need to be diligent to get the right ones.

 

[dan juhasz]

@DanielSlocum I ordered and used the Milodon deep brass core plugs. Quality product that felt proper as it was driven in.

 

[RJRENTON]

Correct Mopar size is 1 41/64".

My preference is brass....more corrosion resistance. I use Loctite on the brass cup after cleaning the block's hole to where its applied. Allow for it to cure....its an anerobic material.
BOB RENTON

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