Which Spark Plug??

[mustangman94]

I have a 94 GT and all I have upgraded electically wise is a MSD Coil. I need new plugs and I'm gunna use copper Autolite's, but I looked on here and everyone says to use 24's. But on the Autolite website here's what it says:

V8-5.0L F/inj. HO (D)
Copper Core 764

V8-5.0L F/inj. HO (T)
Copper Core 25

So it's between 764, 25, and 24. SOOO which one is it actaully??

Thanks!

 

[gunfish]

A lot of people use Autolite 24's because they are a colder plug than the factory 25's. Our engines have a tendency to ping with the stock tune, a colder plug helps to eliminate this.

 

[mustangman94]

Ok that helps, thanks!

What is the 764 plug then? A hotter plug?

 

[HISSIN50]

764 is for the Cobras.



I also run 24's on GT heads.

Good luck.