OK 5.7 HEMI OWNERS WHAT SPARK PLUGS DO YOU PUT IN.THE DEALER STATED ONLY THE COPPER CHAMPIONS PLUGS WILL WORK.NO PLATINUM OR DBL PLATINUM.DEALER STATED ENGINE WAS DESIGNED FOR THE COPPER PLUGS.TELL ME THEY ARE WRONG .PLEASE.

 

copper

 

Why are you yelling?

 

THE HELL IF I KNOW WHY

 

If you take off the caps lock key you will get better answers, LOL!

The best plugs for our engines are the stock Champions. NOBODY has ever proven any gains from more expensive, fancy plugs. They just state they feel better, oh please.

Most of the forced induction guys use them, we just gap them tighter to lower the temps.

 

Unless you have a turbo/supercharger, use stock coppers. You wasting your money if you do otherwise, anyone who tell you differentely needs to recalibrate their butt dyno

 

I've put Iridiums in about 6 different vehicles. I like the results from these plugs and think they will last a long time too. What got me started on the this was I put copper in a 02 chev 6.0 L and it was misfiring randomly so bad that fuel was getting into the oil. It still ran fine it would misfire below 1200 rpm. This stumped me for a long time. Then when I was ready to give up on it I installed Iridiums and that changed everything. No more misfire and that engine ran like brand new. I've installed them in Ford Chev and several chryslers. No complaints here.

 

NGK 5306s here. No more Champions for me.

 

I running NGK Iridiums my self work great, I was planning on NGK coopers but when I buy a set they were all out and I did not want to wait for them to order a set, They had Iridiums NGK's in stock more money but they last longer also.

DONT USE PLATINUM all I been hearing is bad stories about them from ruff running to drop in MPG and the way gas prices are going up every day every MPG helps.

 

whats the gap exactlya? i was gonna get new plugs tomorrow, NGK iridiums. but i want to know if i need to do anything or just unscrew the ol ones and drop in the new ones?