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WAO Racing said:
They help prevent detonation. As far as n/a driving, you would just need the correct heat range.
ok, i see the point about the recessed tip. Couldn't I just run the nitrous plugs all the time?

I was thinking of picking up a set of ngk's that are 1 heat range colder. would those be ok for everyday driving?
 

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Macs Stang said:
ok, i see the point about the recessed tip. Couldn't I just run the nitrous plugs all the time?

I was thinking of picking up a set of ngk's that are 1 heat range colder. would those be ok for everyday driving?
The only problem with running a nitrous plug all the time is if you use say like NGK #8 or AR3934 and colder plug is that they will foul out easily for everyday driving. If you only need 1 or 2 step colder plug usually there not recessed tipped. You dont get into recessed tipped plugs until you need 3 or more heat ranges colder than say like NGK #5 or #6, or autolite 3924 and 3923's. But all that determines on how much you are shooting and what the motor likes.
 

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I will be spraying a 75 shot right away and then eventually when I am used to the 75 shot I will go up to the 100 shot.

So 1 step colder should be good for me then?
 

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Macs Stang said:
I will be spraying a 75 shot right away and then eventually when I am used to the 75 shot I will go up to the 100 shot.

So 1 step colder should be good for me then?

I would use one step colder until you get to a 150 shot and then go 2 steps colder. That will be safe, usually anything 100 and under you could probably get away with using stock heat range.
 

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virgil said:
min. of a 150 shot thats the smallest my kit can go thanks

I would go with 2 steps colder until you get up to 200. And then you want to start looking for a plug that has a recessed tip and short ground strap. You really wont be able to drive on the the race plugs because they will foul out idling around town. They are meant for wide open use.
 

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silverstang306 said:
Hey does anyone know what is a good plug the GT-40P heads?
For nitous use I ran autolight 763's or 103's...2 steps colder than stock.
 

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My buddy has a 94 Cobra with GT 40 heads. He has most bolt ons and a 150 shot. He got the NGK TR6 plugs but what do they need to be gapped at?
 

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This thread has some good information. ;)

It is kinda interesting that the 4.6 liter uses the same plugs as my 2000 silverado w/5.3L. I am running the ngk tr-6's #4177 right now.
 

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mikey9495 said:
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]
---------------------------------------------------------------------

I didn't see any Motorcraft plugs listed for the stock E7 heads.
I am running an 80 shot on my stock '87 5.0.
The Motorcraft OEM replacement plug is: ASF42C correct?
What would 1 step colder be? 52c?

Thanks!
 

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Great thread! This should be stickied to the turbo and blower topics too. Plug ranges apply to all combos. Thanks!
 

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Iridium plugs?

Are any of you guys running Iridium plugs and Nitrous?
Pro's & cons? Planning on installing ITF22 Part#5332 At http://www.densoproducts.com/ with a 150 shot?

http://www.corral.net/photopost/showgallery.php?cat=500&ppuser=79044

89 Mustang GT with a 347 Stroker, Mohle forged pistons and rings, Eagle scat crank, Lunati H beam rods, Scorpion 1.6 Roller Rockers, CHP stud girdle, AFR 185 heads with spring upgrade, F-303 Cam, RPM II Intake, 30# injectors, 80mm Mass air, 70mm Accufab TB, BBK cold air, 190 FP, MSD-6AL Ignition, MSD timing controller, MSD Coil, 150 Shot NX system, 7QT Milodon pan, Bassani ceramic equal length headers, 200 amp Power Master alternator, BBK H pipe into three stage Flowmasters, BBK under drive pulleys, Aluminum Rad, B&M Hammer, Lentech Street Terminator AOD into 3.73 gears, BBK rear control arms, Aluminum drive shaft with loop. Engine dyno #s coming soon.
 

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Can us classic guys get some numbers for stock, 1, and 2 steps colder for heads that have 13/16 holes?
 

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I was wondering if anybody has a cross over for gt-40x heads. The x heads call for a motorcraft ASGF-32C. If You try and cross it over it to a autolite it is a different plug then the iron gt-40's. (I know cause my 95 cobra calls for a autolite 765, when i had the iron heads on it, i beleive?) I just hope somebody can cross over an autolite plug from the motorcraft ASGF-32C (and a heat range or two colder) for the GT-40x heads. My problem is with the new motor in my cobra it has 10to1 compression (with flat top pistons and my 58cc X heads) and i need a colder plug so i can feel safer when spraying it more then a 125 shot.
 

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just because nobody cares.....

my ls1 motor uses the same plugs as my iron gt40's :eeek:

i had no idea......
 
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