haven't seen any threads on what kind of plugs we are using. Normally I run NGK's, but right now it's AUTOLITE platinums. My favorite plugs were the old AC Delco rapid fires from the mid 90's, but they don't make those anymore. So what plugs are you running?

 

Accel plugs that came in the accel tune up kit. But have read about good results with the Champion plugs

 

Hi i need to know what the # are on the champion plugs are. i have a 4.0 ..6cyl jeepcherokee. plez and thanks ....

 

Check here

I use the ACCEL plugs.

 

Champion coppers. I've also heard good results with ngk coppers

 

88-98 Champion Coppers, 99+ NGK's

Don't over think plugs in the 4.0, these engines don't do any better (and some do worse) with fancy 2,3,4 prong platinum superman approved plugs, I've tried a few different kinds and good ole coppers run the smoothest and give me the best mileage.

 

I agree.

87-99: Champion copper plugs

00-01: NGK copper plugs are my #1 choice.. Some guys have had good luck with Autolites. Champions will run okay, but they get a pretty wide gap after 30k.

 

Thanks for putting the right years up, not sure what I was thinking when I posted earlier.

 

I have Champion RC12ECC in mine

what model number are you guys saying is the best Champion? I hear the 438's are best.

What model are the "COPPER" cores?

 

champions ftw