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Rebel73

Nov 30, 2011 11:04 AM

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!

Tbar	Nov 30, 2011 02:37 PM

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.

Rebel73

Nov 30, 2011 03:02 PM

how about these plugs?

http://www.latemodelrestoration.com/...ug-For-46L-3V#

Tbar	Nov 30, 2011 03:22 PM

They should be fine. I've never used the Ford Racing plugs. They are alot cheaper (price wise) than the others.

Rebel73

Nov 30, 2011 03:24 PM

great, thanks. Now I just need to figure out if I have the 12mm or 16mm threads.

Tbar	Nov 30, 2011 03:28 PM

I can't recall when in 08 the changed the heads.

Rebel73

Nov 30, 2011 03:31 PM

yah, I have to look at the coil engineering number. thanks again for your input.

cdynaco

Nov 30, 2011 03:44 PM

Quote:

Originally Posted by Tbar (Post 6190506)

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.

http://www.charliehorse.com/Plug%20Boot%20w.JPG

New plug on the left:

http://www.charliehorse.com/New-Old%20SparkPlugs.08.jpg

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