I agree with weswing.... how the heck would a sparkplug know what kinda of head it was in... the only thing that could make it foul out would be the air fuel mixture or if you didnt gap it properly... I think he was FOS.....

 

Travelinman and weswing04, first of all i didnt say the spark plug knew what head it was in, that was just a pointless comment, the ignition system is setup to run copper plugs. When they designed the engine thats what they used to test it. The coils put out certain power to the plugs and if there platinum they will fire more hot and could caulse misfire or complications.

 

what is the gap for our Hemi's?

 

From the 05 service manual...

SPARK PLUGS
ENGINE PLUG TYPE ELECTRODE GAP
3.7L V-6 ZFR6F - 11G (NGK) 1.1 (0.042 in.)
4.7L V-8 RC12MCC4 1.01 mm (.040 in.)
5.7L V-8 Champion - RE14MCC4 1.14 mm (.045 in.)
8.3L V-10 RC12ECC 0.033 to 0.038

Roger...

 

After reading through these posts, I guess I better go change the factory plugs in 03' with 93,000 miles on them! I went to my ex-local mechanic to price a change out. He told me the platinum plugs installed should last 100K. I now understand the RAM 1500 ain't got no platinum plugs!

 

Damn, my old company truck had 130,000 miles on them before I changed the plugs out ('02 GMC Sierra). That was a company, they didn't do any upkeep on it, and really didn't need to, it was a rock solid truck for the years I drove it. I gave it a full tune-up at the 130 mark when the company gave it to me. I didn't care until it was mine, but in that particular truck, no issues with the plugs, and I always drove it with a 20' utility trailer loaded to the gills..

Now on my RAM, no way in hell I'd let it go that long before changing the plugs. 30k doesn't seem that bad to me, so I don't mind throwing coppers in there if that's what they want....

 

I agree about the Champion plugs -- never bought a good one. I, too, put 5306s in mine at 87K. Immediate improvement in driveability, mostly due to the fact it was 60K late for the change. The gap in the original plugs was probably .065.

 

On my wife's '06 300C, it looks like it'll be a breeze. All sixteen plugs are right there on top with no obstructions. Plus, no plug wires to mess with. The cars very likely have the same plugs as the trucks. just better access.

 

I've read in many places NOT to use anti-seize. It adversely affects the torque needed to put them in. It's only 14 ft/lbs, and apparently the anti-seize provides enough lubrication to accidentally torque 'em too much. I paid $1.80 ea for my NGK 5306s and the folks I bought the truck from charged me $177 to change 'em. I may try the next set (in four years or so) myself. Apparently not hard, just aggravating. I think the socket size is 5/8"

 

Just got back from the LA Auto show and swapped in a set of brand new Pulstar spark plugs.....Big difference in performance and overall startup. Much cleaner...and very well worth the money