Can Anyone tell me what plugs run the best in the 2006 4.7 H.O. , Hotter , Colder , Platnum or copper top I have no problem using Factory product

 

Mine runs the best on the Iridium plugs. I used NGK Iridiums.

 

I'm new here, but search.
Autolite 3923's
Check it out in the FAQ's section, HUGE discussion. Guess our trucks dont' like platinum

 

platinums run hotter than copper, dodge tells me to use copper but i found some tech articles online that say the high out uses platinum, then i found articles saying DO NOT use platinum....havent popped in any iridiums in my engine though... my rx8 likes iridiums

 

3923 for standard 4.7
3922 for 4.7 H.O.

Check at 6,000 miles for carbon build up. Move to 3923 if your driving habits results in carbon on plugs... or change your driving habits...

Change them out every 12~15,000 miles. They are only like $20 for all 8.

And yes, searching could lead you an entire day of reading about this subject.

To answer your next question; the gap difference between .35 & .40 is minor, pick whichever you like, or split the difference. Just know that with use the gap will widen, more so than platinum or iridium does as the copper is weaker.