I think number 4 is firing best in my 5.2 right now and the 3 or 6 one in the niner is best for it.
Kolak has a good ignition upgrade if you are looking to do plugs, wires, coil, etc and really get it running smooth.
I think he recommends autolite, but for stock a lot of people recommend champion. Copper plugs seems to be the popular opinion.
1996 ZJ Green Laredo V8, 2.5" OME and Bilsteins, 33's, Holes drilled in the roof.
1998 ZJ Platinum Limited 5.9, Backyard parts fodder
1987 Mercedes 300D Turbo, the diesel daily, 30mpg in style
Originally Posted by Texas ZJ1
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
I would recommend the stock Champion copper core plug .
I run NGK FR-5's in my 5.2 and they work good .
Run Autolites in my 5.9 , they work good , but I was getting better mpg's with the Bosch plugs the PO installed . Not recommending Bosch plugs , just saying .
Run Champion double platinum's in my wife's 5.9 . Second set now , took 35k from the first set w/o issue . Also running an ignition upgrade via MSD on this jeep . Kinda wish I would have got these for my 5.9 , great product IMO .
I've had Autolite, Autolite platinum, Autolite double platinum, Champion copper, NGK, and currently Autolite racing (copper core, just thicker and shorter ground strap). They all seem to work about the same. I change them every year though.
i use the ngk twin platnum. they are only like 3$ each and are a better in the ranks of good better best. im not paying for duble iridium plugs on my weekend jeep its not happening. now you have to gap all your plugs. every plug from advanced iv gotten that was pre gapped was of by.010 it should say the proper gap on the plaqard on the radiator support. i belive kolac recomemnded a colder range plug than factory with his mods