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!

 

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.

 

how about these plugs?

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

 

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

 

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

 

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

 

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

 

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: