Best plug to use on my 428

[Ford428CJ]

I run Autolite 124's in my 428. 2 steps colder then the 45's. Those are my favorit plugs to run! Gap @ .035 to .040. JMHO

[Ron61]

Same here. I like the Autolites better and they seem to work better in my engine. I run the 45s as I do more street driving and they don't foul as easy. I gap mine at about .047 due to the Jacobs ignition liking that setting better than the others I have tried.

Ron

[Ford428CJ]

Originally Posted by Ron61

I run the 45s as I do more street driving and they don't foul as easy.
Ron

He is running a MSD6 Box (I ran a MSD 6AL on my 428)....So fouling out a plug is a little hard to do with a box on it. With out a box is a different story.

With the 124's, you will notice a difference. As long as the 428 is wormed over a little. I think you will like the performance that you get out of them and not a problem for street driving! JMO