gt40 lower tap sizes

tim281

New Member

Dec 18, 2005

125

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Portland, OR

Mar 30, 2009

#1

• Mar 30, 2009

• #1

I looked threw a bunch of searches but didn't see any info on tap sizes. Can someone tell me the thread size of the IAT that is required for runner #5?
I am also probably going to run the EGR coolant and would like to know that tap size as well.
I am sure there must be a good write up or post someone probably has ear marked.
Thanks.

 

4G-KDMP

10 Year Member

Jul 23, 2005

935

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CA

Mar 30, 2009

#2

• Mar 30, 2009

• #2

3/8 NPT (national pipe thread)

This should help
Bad Ass Mustangs Forums - Freaky's Official Explorer and GT-40 intake thread. 56k, don't bother

 

tim281

New Member

Dec 18, 2005

125

1

0

Portland, OR

Mar 30, 2009

#3

• Mar 30, 2009

• #3

Thanks for the info. BTW, I am assuming the TB coolant thread is the same size at 3/8" NPT? I didn't see that listed in the thread.

 

tim281

New Member

Dec 18, 2005

125

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Portland, OR

Apr 1, 2009

#4

• Apr 1, 2009

• #4

I drilled the #5 runner just fine. Thanks for the thread size info.

Can someone confirm that the EGR Coolant thread is also 3/8" NPT -18?
Thanks,
T

 

the pony boy

Founding Member

Apr 19, 2002

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10512

Apr 1, 2009

#5

• Apr 1, 2009

• #5

yup same size.a 9/16 drill bit and 3/8 npt tap will work. phil

 

S

surfandturf

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Feb 28, 2009

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Cincinnati, OH

Apr 1, 2009

#6

• Apr 1, 2009

• #6

I had the same problem read the post from me this morning

 

jrichker

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Mar 10, 2000

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Dublin GA

Apr 2, 2009

#7

• Apr 2, 2009

• #7

The ACT uses a 37/64" drill and a 3/8" pipe tap. See Industrial Supply Equipment from MSC Industrial Supply or McMaster-Carr if you can't find the drill bit or tap locally.

 

tim281

New Member

Dec 18, 2005

125

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0

Portland, OR

Apr 2, 2009

#8

• Apr 2, 2009

• #8

Thanks for all the replys....the place I work has a full machine show so I got all the tools.
I think I will be forced to put a bit extra pipe thread tape on the IAT because when I got handed the drill bit from a friend in the tool crib it was actually the 39/64ths...I didn't realize it until it was finished....only 1/32" too large of a hole so I am not too concerned, the threads still look fine.
I will make sure the EGR coolant hole is the 37/64 before I start drilling.