Hemi Spark Plug Change

[04QC4X4]

I was reading the maintenance schedule in my owners manual and it says to change the spark plugs every 30k miles on a Hemi.  Why so often?  I've always changed plugs and wires every 75k - 100k miles.  I'm going to stick to the recommended schedule so that my lifetime warranty will be honored, but I plan on doing as much as I can myself.  I'm just going to keep good records and reciepts for oil, filters (etc....),  But I'm puzzled about the frequency of spark plug change outs.

[Cumminalong]

I'd be more inclined to just pull them at that interval and inspect them.

I would "assume" they will be just fine.

Put a little anti-seize on them and put them back in.

It's actually not a bad idea to pull them and re-torque them anyways, just to make sure they haven't worked loose.........oh sorry, that's for Fords.

[Cujo]

I've heard horror stories of seized plugs that have been in for 75,000+ miles. Yeah, I'd at least pull them out and inspect at 30,000 miles.

[dragginaknee]

What's a spark plug?

[lilfroger]

Mds...and it's got the fact it's got 2 plugs per cylinder.

[DBLR]

I to wonder what Spark Plugs are, they say my wife's Sebring has them yet when I look at the engine you can't find them 

[noplugs]

I to wonder what Spark Plugs are, they say my wife's Sebring has them yet when I look at the engine you can't find them 

WHa? You actually found the engine? Is it really under the hood as they claim?

[Buford445]

I to wonder what Spark Plugs are, they say my wife's Sebring has them yet when I look at the engine you can't find them 

 Is it a 6 cly ? Look UNDER THE INTAKE 

[04QC4X4]

There are 2 plugs per cylinder on an 08 hemi???  I know the 4.7 has 2 per cylinder, but I didn't think the hemi did until 2009.

[lilfroger]

The 5.7 Hemi has had 2 plugs per cylinder for a while.

5.7L
The ignition system is controlled by the Powertrain Control Module (PCM) on all engines.
The 5.7L engine uses dual output coils, and 2 spark plugs per cylinder.
Each cylinder is equipped with 1 dual-output coil. Meaning one coil mounts directly over one of the dual spark plugs
for 1 high-voltage output.

Installation:
5.7L
1. Using compressed air, blow out any dirt or contaminants from around top of spark plug.
NOTE: Use dielectric grease on each of the spark plug boots before installing the coil.
2. Position ignition coil (1) into valve cover and push onto spark plugs.

[04QC4X4]

Thanks for the info.