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BB screw in freeze plugs
#1490907
08/26/13 01:19 AM
08/26/13 01:19 AM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
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OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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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.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: BB screw in freeze plugs
[Re: Von]
#1490908
08/26/13 01:54 AM
08/26/13 01:54 AM
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Joined: Feb 2007
Posts: 6,295
U.S.
moparniac
master
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master
Joined: Feb 2007
Posts: 6,295
U.S.
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I've seen a regular freeze plug put in then the block around the freeze up was tapped in 3 places aroubd the plug and had fasteners with a washer under the head to hold plug in.
Mopar Performance
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Re: BB screw in freeze plugs
[Re: Von]
#1490910
08/26/13 11:15 AM
08/26/13 11:15 AM
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Joined: Jan 2003
Posts: 17,924
Akron, Ohio
ProSport
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,924
Akron, Ohio
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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.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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Re: BB screw in freeze plugs
[Re: ProSport]
#1490912
08/26/13 12:20 PM
08/26/13 12:20 PM
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Joined: Jan 2003
Posts: 75,088
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,088
A Banana Republic near you.
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Quote:
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.
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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Re: BB screw in freeze plugs
[Re: JohnRR]
#1490913
08/27/13 04:20 PM
08/27/13 04:20 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
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OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Quote:
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.
I wonder what thread they are? 
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: BB screw in freeze plugs
[Re: TrWaters]
#1490915
08/27/13 05:00 PM
08/27/13 05:00 PM
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Joined: Jan 2003
Posts: 75,088
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,088
A Banana Republic near you.
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Quote:
http://www.youtube.com/watch?v=V8_tsvQSq6k
I know its a Ford, but you get the idea.
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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Re: BB screw in freeze plugs
[Re: JohnRR]
#1490916
08/27/13 05:07 PM
08/27/13 05:07 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
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OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Quote:
Just checked Mcmaster , 1 1/2 -11 pipe tap is about 175 and a shallow hole tap is another 217 ...
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?
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: BB screw in freeze plugs
[Re: Von]
#1490917
08/27/13 09:57 PM
08/27/13 09:57 PM
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Joined: Jan 2003
Posts: 75,088
A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,088
A Banana Republic near you.
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Quote:
Quote:
Just checked Mcmaster , 1 1/2 -11 pipe tap is about 175 and a shallow hole tap is another 217 ...
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?
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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Re: BB screw in freeze plugs
[Re: JohnRR]
#1490918
08/28/13 12:36 AM
08/28/13 12:36 AM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
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OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Quote:
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 ...
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?
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: BB screw in freeze plugs
[Re: Von]
#1490919
08/28/13 01:00 AM
08/28/13 01:00 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
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 ...
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?
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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Re: BB screw in freeze plugs
[Re: Von]
#1490920
08/28/13 01:14 AM
08/28/13 01:14 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
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.
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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Re: BB screw in freeze plugs
[Re: Jerry]
#1490923
08/28/13 08:24 AM
08/28/13 08:24 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
is there a rule mandating screw in freeze plugs? I seem to have some seapage around mine as i'm inspecting the block getting ready to reinstall.
I've never seen one
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Re: BB screw in freeze plugs
[Re: MR_P_BODY]
#1490924
08/28/13 01:00 PM
08/28/13 01:00 PM
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Joined: Oct 2003
Posts: 3,698
NE Oklahoma
Von
OP
master
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OP
master
Joined: Oct 2003
Posts: 3,698
NE Oklahoma
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Quote:
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
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.
Last edited by Von; 08/28/13 01:11 PM.
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
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Re: BB screw in freeze plugs
[Re: Von]
#1490925
08/28/13 02:58 PM
08/28/13 02:58 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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No doubt some racers have been doing the screw in freeze plug thing for years. I bought the books, thought it looked really trick.
So I was going to do this, back in the early '80s. It was a chevy 283, boy did I learn a lot on that engine. For example, the length of main studs have to work with the crank main journal size! (the 283's 2.30" mains didn't work with ARP main studs for a 2.45" main)
Anyway, the mechanical foreman was my buddy and regardless of cost, he gave me the right size pipe tap. I took it home, stuck it into the hole, and ran right into the backsides of the cylinders. Bummer! What do we do now? As I didn't want to admit defeat, I put the tap in my rollaround toolbox and forgot about it. It's still there.
Those racecar shops must have special short taps for threading. I went back to the brass cup plugs and put my "tricking out" expertise to use somewhere else.
That maybe when I bought my Craftsman die grinder. Now THAT was a good investment!
R.
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Re: BB screw in freeze plugs
[Re: Von]
#1490926
08/28/13 03:34 PM
08/28/13 03:34 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Quote:
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
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.
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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