I'll try again NGK ZFR5N (3459) anybody using these plugs ?

OldmanRick said

I'll ask.......What combo are you're using them in? Looks to be used on V10 and some jeep applications?

Not saying they wont work, but if you explain your specific need, someone here should be able to help with a recommendation?

Click to expand...

I've got a 273+.030 flat top pistons, 302 heads/ 8.8-1 / edel performer, small TQ, GM HEI, stock cam and hyd valve train. auto with 3.23s in a Dodge A100 pickup.
I was mostly interested in these plugs because of what I've read about extending deeper into the chamber (more centered) , slant6 guys said they get a smoother better performance And better mileage. I'm just asking what others think ?