BB screw in freeze plugs

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I always just wire wheel the outside edge and JB-weld them to the block. I had one shoot out one time in 2nd gear and almost wrecked.

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How does the JB hold up ? I have some to install in a block that some donkey gouged the holes up pretty good when removing them during the rebuild before this one

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I don't think that screw in plugs are NPT , if there were you'd have a tough time tapping them without some special taps because of how far the tap needs to go in to get the correct taper.

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I wonder what thread they are?

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http://www.youtube.com/watch?v=V8_tsvQSq6k

I know its a Ford, but you get the idea.

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Thanks Tom ...

I stand corrected ... surprise ??

They are NPT , those taps aren't cheap and it looks like you need 2 , one to start the job and a second that is cut down so you can properly tap the hole so the plug is the correct depth. I have a 383 that someone gouged up the plug holes , that would be the way to fix them ...

Just checked Mcmaster , 1 1/2 -11 pipe tap is about 175 and a shallow hole tap is another 217 ...

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Just checked Mcmaster , 1 1/2 -11 pipe tap is about 175 and a shallow hole tap is another 217 ...

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Just checked Mcmaster , 1 1/2 -11 pipe tap is about 175 and a shallow hole tap is another 217 ...

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A guy on the Bag has the standard tap for 10 bucks. It is used with a few chipped teeth, but will work for this job.

Also, I do believe for a Mope you need a 1.25 NPT tap, not a 1.5?

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I was just coming to update this .

The holes in the side of the block are 1.625 , 1 1/4 tap needs a 1.5 hole , 1 1/2 half tap needs a 1.75 hole .

I have both taps here at work , the 1 1/4 isn't going to work so you have to use a 1 1/2 after you open up the holes in the block.

Let us know how it works out ...

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The holes in the side of the block are 1.625 , 1 1/4 tap needs a 1.5 hole , 1 1/2 half tap needs a 1.75 hole .

I have both taps here at work , the 1 1/4 isn't going to work so you have to use a 1 1/2 after you open up the holes in the block.

Let us know how it works out ...

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I was going off of this chart. http://www.engineeringtoolbox.com/npt-national-pipe-taper-threads-d_750.html

I thought the nominal OD of 1.660 meant the 1.25 tap should work?

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You need to look at the tap drill size so you can
get close to the number of threads in.. in your case
of 1 1/4 NPT its a 1.5 tap drill

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This is what I use on some of my blocks that have
had issues... never had one of these come out...
I put Permitex on it and tighten it up

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I see they have one that is 1.625 and expands to 1.655. I guess that is the plug I need? f

How deep do the plugs sit in the block? I ask because the plug I need to fix is behind the starter. Im afraid there may be interference between starter and the head of the bolt.

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The nut does stick out some... but to be honest I
havent ever had one hit the starter.. I do use the
mini Chrysler production starter

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The nut does stick out some... but to be honest I
havent ever had one hit the starter.. I do use the
mini Chrysler production starter

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Had Osmileys order me 2 today.

What color of permatex do you use?

I have a robbmc starter, so hopefully it clears.

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I use the good old red Permatex... also put a bead
of it on the overlapping lip just in case

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On a stock RB block, who has done it?

Any links to the plugs? Ive been told they need to be a shallow plug to keep from bottoming on the cylinders?

1.25 npt tap?

Thanks for any help.

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This is what I use on some of my blocks that have
had issues... never had one of these come out...
I put Permitex on it and tighten it up

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On a stock RB block, who has done it?

Any links to the plugs? Ive been told they need to be a shallow plug to keep from bottoming on the cylinders?

1.25 npt tap?

Thanks for any help.

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This is what I use on some of my blocks that have
had issues... never had one of these come out...
I put Permitex on it and tighten it up

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Mr P what is the name of the company that makes the freeze plug with the nut
in the center?

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I'll have to look tomorrow but its the standard company
that makes most of them... I have posted the name
and P/N in other post but I forget right now