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Old 01-26-2004, 01:43 AM   #1
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Arrow nitrous plugs quick reference guide

Hi guys I wanted to compile a "quick reference" chart of the most common nitrous spark plugs for 5.0 and 4.6 Mustangs. Here is what I have gather thus far....

5.0
Stock E7 heads:
AUTOLITE
stock--stock 25 (5) [14m, .460 Reach, 5/8" Hex]
1 step colder--24 (4) [14m, .460 Reach, 5/8" Hex]
2 step colder--23 (3) [14m, .460 Reach, 5/8" Hex]
-----AR133 (3) [*recessed tip, racing plug]
-----AR132 (2) [*recessed tip, racing plug]
-----AR131 (1) [*recessed tip, racing plug]

NGK
stock--(UR45) 6945 (Heat Range - 4) [14m, .460 Reach, 5/8" Hex]
1 step colder--(UR55) 2248 (5) [14m, .460 Reach, 5/8" Hex]
2 step colder--(UR6) 7773 (6) [14m, .460 Reach, 5/8" Hex]
-----(R5673-8) 3249 (8) [*recessed tip, racing plug]
-----(R5673-9) 3442 (9) [*recessed tip, racing plug]
-----(R5673-10) 4050 (10) [*recessed tip, racing plug]


GT40 Heads:
AUTOLITE
stock--765 (Heat Range - 5) [14mm, .708 Reach, 5/8" Hex]
1 step colder--764 (4) or 104 (4) [14mm, .708 Reach, 5/8" Hex]**
2 step colder--103 (3) [14mm, .708 Reach, 5/8" Hex]**
-----AR473 (3) [*recessed tip, racing plug]
-----AR472 (2) [*recessed tip, racing plug]

**The difference between the 764 plug and the 104/103 plug is the thread. The 764 plug is a half thread whereas the 104/103 plug is a full thread. The full thread plugs are duplicates of the half thread plugs in every other aspect, they both protrude the same amount into the combustion chamber.

NGK
stock--(TR4) 3754 (Heat Range - 4) [14mm, .708 Reach, 5/8" Hex]
1 step colder--(TR55) 3951 (5) [14mm, .708 Reach, 5/8" Hex]
2 step colder--(TR6) 4177 (6) [14mm, .708 Reach, 5/8" Hex]
-----(B8EFS) 1049 (8) [*recessed tip, racing plug]
-----(B9EFS) 1085 (9) [*recessed tip, racing plug]

TFS, Edelbrock, and AFR Heads:
[14mm, 3/4" Reach, 5/8" Hex, gasket seat]
AUTOLITE
1 step colder--3924 (4) [*recommended starting point]
2 step colder--3923 (3)
-----AR3933 (3) [*recessed tip, racing plug]
-----AR3932 (2) [*recessed tip, racing plug]
-----AR3931 (1) [*recessed tip, racing plug]

NGK
1 step colder--(FR5) 3686 (5) [*recommended starting point]
2 step colder--(BKR6EY) 3696 (6)
-----(R5671A-8) 4554 (8) [*recessed tip, racing plug]
-----(R5671A-9) 5238 (9) [*recessed tip, racing plug]
-----(R5671A-10) 5820 (10) [*recessed tip, racing plug]

MOTORCRAFT
1 step colder--AWSF22C
2 step colder--AWSF32C



4.6
MOTORCRAFT
stock--AWSF-32C (copper)
1 step colder--AWSF-22C (copper)
2 step colder--AWSFA-12C (copper)
AGSF-32C--FRPP heads

NGK
stock--TR-55/ 3951
1 step colder--TR-6 4177
1 step colder--NGK TR6
1 step colder--NGK BR6EF (Non-projected, resistor, v-groove copper)
2 step colder--NGK BR7EF (Non-projected, resistor, v-groove copper)
2 step colder--BP7EFS [PN - 3526] BR7EF [PN - 3346]
2.5 step colder--R5724-8 [PN - 7317]
3 step colder--R5724-9 [PN - 7891]
4 step colder--R5724-10 [PN - 7993]

AUTOLITE
stock--764
1 step colder--103
2 step colder--AR94
3 step colder--AR93
4 step colder--AR92

CHAMPION
YS-59C

DENSO
stock--IT16
1 step colder--IT20
2 step colder--IT22
3 step colder--IT24


Please feel free to correct any errors I have as well as give me part numbers to add. Any help is appreciated!!! I'll be updating this repeatedly
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Old 01-26-2004, 03:19 PM   #2
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Old 01-26-2004, 03:52 PM   #3
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On those 5.0 plugs, its going to depend on the heads. None of those plugs you mention are for stock E7 heads. Autolite 25 are stock, 24s 1 step colder, and 23s 2 steps colder.

On the 4.6s, the NGK TR55 are stock heat range, TR6 1 step colder.

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Old 01-26-2004, 09:08 PM   #4
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nice info thx
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Old 01-27-2004, 02:20 AM   #5
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Thank you LXH89, that's what I was wanting. Corrections and additions to the list. I think it'll be helpfull........

Any more suggestions????
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Old 01-27-2004, 12:20 PM   #6
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The NGK R5671A-9 is a great nitrous plug. It has a recessed electrode and a shortened ground strap to help avoid detonation. It comes in other heat ranges, with a nine being about 6 or 7 ranges from stock. This plug works on TFS, Edelbrock, and AFR heads. Anything that uses a long reach plug. I have the number for the stock heads as well, but I will have to look at the box later to get the number.
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Old 01-27-2004, 02:39 PM   #7
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For Non-Projected tip plugs on the 4.6 use the following:

NGK BR6EF - 1 Step Colder (Non-projected, resistor, v-groove copper)

NGK BR7EF - 2 Step Colder (same spec as above)

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Old 01-27-2004, 09:09 PM   #8
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Awesome and awesome adding those number right now

mustangmichael get back to me whenever you can with those number

LXH89, once again thank you

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Old 01-28-2004, 04:05 PM   #9
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GT 40 Heads run a wierd plug, I will check when I get home to see what they are. I have one ported head sitting in the basement, and I can screw a couple of plugs into it to see which one it takes.
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Old 01-29-2004, 10:52 AM   #10
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Old 01-29-2004, 09:12 PM   #11
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The Cobra 5.0L head uses the Motorcraft AWSF32C as well. I thought the AWSF22C was one step colder. Is that not rue?
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Old 01-30-2004, 01:11 AM   #12
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Polygon I'm not totally sure, that's why I wanted everyone's input. Anyone........
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Old 01-31-2004, 01:58 AM   #13
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Hey no big deal mikey, I'm just trying to contribute.

When I got the nitrous kit in, the shop originally sold me Autolite 764's (the plug for the GT-40 heads) because I asked for them by name. When I wanted to go a step colder, they looked it up and discovered that Autolite doesn't make a range colder for the GT-40 heads. They told me to go with the Motorcraft AWSF22C.
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Old 01-31-2004, 02:28 AM   #14
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No it's GREAT that you are contributing; I'm hoping more will toss in their part numbers!
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Old 02-02-2004, 04:12 PM   #15
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Old 02-02-2004, 05:00 PM   #16
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Edelbrocks can use the autolite (not light) 3924/3923 as well.
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Old 02-02-2004, 08:11 PM   #17
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Jay thanks for the input, and thanks for the spelling correction!!

HAHA!
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Old 02-08-2004, 02:07 PM   #18
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Up to the top for some more additions to the list..........
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Old 02-15-2004, 07:42 AM   #19
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I use a NGK TR55 and TR6 in my 93 Cobra GT40 irons. I believe the Autolite 103s are 1 range colder than the 764s.

Its been a while since I ran nitrous, but I think I'll be getting another kit soon so I better start remembering.
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Old 02-15-2004, 10:37 AM   #20
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Cool, thanks for the input!
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Old 02-16-2004, 01:07 PM   #21
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plugs

any one know any info on 13/16 plugs for a 351 windsor
i need a couple differnet plugs .stock ones and 2 steps colder!
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Old 02-16-2004, 05:09 PM   #22
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Stock heat range specified for the GT40 irons was TR55. 1 range colder is TR6.

I have also found guys using these plugs in GT40 irons, but I am unsure how much colder than stock they are.
NGK BR7EFS
Autolite AR3933

GT40P heads also use the same plugs.
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Old 02-16-2004, 11:02 PM   #23
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Hey, sorry it took so long, but I finally put a plug in my pocket so I wouldn't forget. I was cleaning out a tool box and found a set. So anyway, for a stock head, the receded electrode plug is an NGK R5673-9. You can change the - to a 10 or 8 I believe and go up or down on the heat range. I run these on my R/S heads... Hope it helps out...
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Old 02-17-2004, 02:11 PM   #24
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Re: plugs

Quote:
Originally posted by big88red
any one know any info on 13/16 plugs for a 351 windsor
i need a couple differnet plugs .stock ones and 2 steps colder!
help!please!!!! anyone?
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Old 02-18-2004, 10:23 AM   #25
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http://forums.modulardepot.com/showt...&threadid=2218

Here's something for the modular guys.
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Old 02-18-2004, 01:45 PM   #26
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Disclaimer: This is going to be long.
I think you got a little mixed up on the GT40, NGK plug. You misunderstood what Mike said. He was referring to the stock, E7 head when he mentioned the R5673-9, not the GT40 head. Here is a list I have put together on the E7 and GT40 head back when I was sorting this same mess out. NGK plugs are reverse of what Autolite plugs are in heat range numbering. Where the Autolite number drops indicating a colder plug, the NGK plug number goes up indicating a colder plug. Also, the NGK plug starting with the letter "R" and the Autolite plug starting with the letters "AR" are racing plugs. Let me begin.

14m, .460 Reach, 5/8" Hex, Tapered Seat (E7 head)
...Autolite...................................NGK
stock 25 (Heat Range - 5).......(UR45) 6945 (Heat Range - 4)
colder 24 (4).........................(UR55) 2248 (5)
colder 23 (3).........................(UR6) 7773 (6)
*recessed tip, racing plugs
......AR133 (3).........................(R5673-8) 3249 (8)
......AR132 (2).........................(R5673-9) 3442 (9)
......AR131 (1).........................(R5673-10) 4050 (10)

14mm, .708 Reach, 5/8" Hex, Tapered Seat (GT40 head)
...Autolite...................................NGK
stock 765 (Heat Range - 5).......(TR4) 3754 (Heat Range - 4)
colder 764 or 104 (4).............(TR55) 3951 (5)
colder 103(3).........................(TR6) 4177 (6)
*recessed tip, racing plugs
......AR473 (3).........................(B8EFS) 1049 (8)
......AR472 (2).........................(B9EFS) 1085 (9)

The difference between the 764 plug and the 104/103 plug is the thread. The 764 plug is a half thread whereas the 104/103 plug is a full thread. The full thread plugs are duplicates of the half thread plugs in every other aspect, they both protrude the same amount into the combustion chamber.

Hope this helps some.

Last edited by Coyfish; 04-16-2004 at 04:51 PM.
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Old 02-19-2004, 12:47 AM   #27
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OK thanks for the input!
I'm gunna sort through that tomorrow when I not so mentally tired and fix my errors....
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Old 02-19-2004, 02:31 AM   #28
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yeah i am looking forward to the edited detailed list as I am thinking of nitrous on my car or a supercharger. I would like to see the info on the plugs when you get done so I can get them at the same time I get everything else for my car. Won;t be tomorrow so need to hury on my account. I just wanted to express my interrest.
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Old 02-19-2004, 04:10 PM   #29
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WHEWHHHH!!!

OK check that out for correctness............
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Old 02-19-2004, 06:29 PM   #30
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Ok, that looks pretty good. The only corrections I would make is this. The "steps colder" on the racing plugs doesn't actually follow the "one step, two step, .." theme. Being that they have a recessed tip, they are actually alot colder and probably only should be used in racing only applications. I know from personal experience that they foul real easily just riding around. Also, the GT40 plugs I was referring too, were including the GT40 Irons. This would eliminate the "GT40 Iron" section you have underneath the "GT40 Heads" section. I also would eliminate the "Non-stock Heads" and "Edelbrock Heads" section as these are covered in the "TFS, Edelbrock, and AFR Heads" section. Speaking of that section, here is some info I have for those type of heads.

TFS, Edelbrock and AFR Heads
(14mm, 3/4" Reach, 5/8" Hex, gasket seat)

AUTOLITE
1 step colder--3924 (4) [*recommended starting point]
2 step colder--3923 (3)
---------------AR3933 (3) [*recessed tip, racing plug]
---------------AR3932 (2) [*recessed tip, racing plug]
---------------AR3931 (1) [*recessed tip, racing plug]

NGK
1 step colder--(FR5) 3686 (5) [*recommended starting point]
2 step colder--(BKR6EY) 3696 (6)
------------------(R5671A-8) 4554 (8) [*recessed tip, racing plug]
------------------(R5671A-9) 5238 (9) [*recessed tip, racing plug]
------------------(R5671A-10) 5820 (10) [*recessed tip, racing plug]

Last edited by Coyfish; 02-19-2004 at 06:42 PM.
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Old 02-20-2004, 12:00 AM   #31
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WOW, once again thank you.

I'll be spending some time right now correcting..............

OK, finished.......

Keep 'em coming!!!

Last edited by mikey9495; 02-20-2004 at 12:27 AM.
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Old 02-20-2004, 01:31 AM   #32
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why would you make hotter plugs to begin with if cold ones help prevent detonation? My LX 5.0 pings on autolite 24s, what would be 2 steps colder from their?
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Old 02-20-2004, 11:55 AM   #33
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Quote:
Originally posted by Triple X LX
why would you make hotter plugs to begin with if cold ones help prevent detonation? My LX 5.0 pings on autolite 24s, what would be 2 steps colder from their?
All cars necessitate a certain heat range of plug based on the setup. Also, these plugs are not specific to mustangs. The same plug can cover dozens of different makes and models. All of their requirements are different based on the motor's needs or what they are trying to accomplish. If you are having problems with a colder plug on a normal driving, stock motor, you might want to check your timing or the gas you are using. From my experiences, that is not normal. To answer your question though, there isn't really a plug colder than a 23 with the size requirements for a stock head. You would have to switch to a different brand plug or an Autolite race plug, which isn't ideal for normal driving.
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Old 02-21-2004, 01:46 AM   #34
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why wouldnt it work for just normal driving or why not use a race plug?
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Old 02-21-2004, 01:52 AM   #35
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as an example of what coyfish is saying about different heat ranges for different combo's I actually run one plug hotter in my car. That enables me to run one size bigger jet and not be rich at idle yet get more top end out of my combo. I can also run teh same jets in my carb for normal driving as I run when racing.
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