The haynes manual says to use the oem champion plugs rc12mcc4 but there are like multiple ones. Ones with copper and what not. Which one is it? And are there any other plugs that work for the 4.7l v8 ? What do you guys recommend?

Thanks

 

Champion copper plugs are the only plugs you want to put in your D. anything else can give you issues.

 

+1 what Mean said. I think the gap is 0.40? HTH.

 

yup gap is .040in and use only copper core champion plugs and your engine will love you long time


lol

 

Haha ok thanks!!!

 

no problem man, anytime

 

for the spark plugs i was looking on summit racing . the champion copper spark plugs says its for the 5.9 l engine. are the spark plugs different for the 4.7l and the 5.9l ? like thread size etc?

will this spark plug socket work for my plugs? its supposed to be a 5/8th in socket

http://www.northerntool.com/webapp/w...4175_200354175

thanks

 

I'm curious why won't other spark plugs work in the 4.7l engine? i know about the platinums cause the tips all weird. but what about iridium spark plugs. why wont those work/?


thanks

 

I have iridium in mine (5.7L) without a problem, but not sure why they would be a problem in the 4.7L,
FF

 

I also have Champion Iridium truck plugs in my 5.9. Works great!