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Supercharged GT/CS spark plug questions...

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Old 11/30/11, 11:04 AM
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Supercharged GT/CS spark plug questions...
Hey guys,

what is the recommended spark plug change interval on a Mustang with SC?
And the proper gap?

Also, what's the best brand to go with?

thanks!
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Old 11/30/11, 02:37 PM
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Usually every 20,000 miles. Your tuner should give you a recommended plug gap,on s/c applications usually 0.30-0.32. I dont think you have much choice as far as brand of plug.You need a colder plug ,Autolite HTO, Brisk Silver.
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Old 11/30/11, 03:02 PM
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how about these plugs?

http://www.latemodelrestoration.com/...ug-For-46L-3V#
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Old 11/30/11, 03:22 PM
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They should be fine. I've never used the Ford Racing plugs. They are alot cheaper (price wise) than the others.
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Old 11/30/11, 03:24 PM
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great, thanks. Now I just need to figure out if I have the 12mm or 16mm threads.
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Old 11/30/11, 03:28 PM
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I can't recall when in 08 the changed the heads.
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Old 11/30/11, 03:31 PM
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yah, I have to look at the coil engineering number. thanks again for your input.
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Old 11/30/11, 03:44 PM
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Originally Posted by Tbar
I can't recall when in 08 the changed the heads.
Dec 07. My Bullitt has the new heads and was built on 1.9.08. Bullitt's were "Job 2". The new heads use a brown plug boot.




New plug on the left:

Last edited by cdynaco; 11/30/11 at 03:48 PM.
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