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-   5.7L (345 cu in) HEMI V8 Specific Topics (
-   -   New Spark Plug used in Police 5.7 hemi (

theweavman 11-28-2011 05:27 PM

New Spark Plug used in Police 5.7 hemi
I have been reading that Dodge is now installing a new precious metal spark plug in all it's police 5.7 hemis, they are being installed in all their new police package vehicles, cars and trucks.....This new plug is supposed to be good for 100,000 miles, instead of the only 30,000 mile ones found in all their standard customer 5.7 hemi vehicles......
Does anyone know anything more about this, like the factory part number and pricing?
can they be ordered from the Parts dept?
Do they fit in all the 5.7 hemis?
Any additional info appreciated, as Mine will be due for replacement in a few thousand miles, and I would like to switch to these if possible.....Thanks

TNC 11-28-2011 11:47 PM

I saw that same information on the police application and spark plug. Coming from a lifetime of GM products and with the later models having 100,000 mile change intervals, I was shocked to see this 30K change recommendation on a modern engine. Then I hear all these horror stories about how the hemi "doesn't like" precious metal plugs, but no real definitive reason why. I'm no engineer, but I can't see why a precious metal plug of the proper heat range and tip design would be some kind of negative for the ignition system or overall performance.

theweavman 11-29-2011 07:06 PM

I've obtained some possible new information from my dealers parts dept.

normal stock Hemi plug part # is SP-LZFR5C11, at about $6-7 bucks each, these are NGK spark plugs

Found that on a 2012, Charger with Police Equipment Group AHB, the Hemi Plug part number is SP-143877AA at $16.25 each.

They are so new that he was showing only 20 of these plugs currently avalible thru out the country. I don't know who makes these.

Currently, this is the only application listed for that plug, so not sure as yet if these are the same plugs that will be going into the 2012 Ram with police package.

I suspect that this will be the plug we are all seeking with a 100k lifespan....but right now I don't know if these will work in other Hemis, and other years...

someone may have to buy one and physically compare it to the normal plug, just to get an idea if it might be compatible

I'm sure in a little time, more info will be found.....Perhaps someone else can find out more

johnnymopar 12-08-2011 04:11 AM

Very interesting, like TNC my Vortec 5.7L GMC goes 100K between plugs. That would be great if these plugs will bring the Hemi up to par.

RT TT 12-08-2011 06:21 AM

i have a feeling that is a dealer only part number quick google search and crossreferance turns up nothing. also believe it to be an iriduim plug just from the price alone.

but on a side note who cares? these plugs on the cheap wil cost around 250+ for 16 and last the same as 3 sets of copper plugs for 150 most ppl do not no how to properly gap exotic plug types and will end up with premature ware also with 2 plugs per cylinder your not really oing to see any performance gains going to this style plug is it nice and conveinent sure it is but its gonna cost pretty buck for it. the police cars its worth it as they are not going to change the plugs theyll dump the cars before they hit 100k

if your truely interested in this style plug go on ngk web site and pick the proper plug. they have alot of useful info on there teaching you what the different numbers and letters mean in their product numbers.

i myself would stay away from plantium. copper or irduim only

Studbuster 12-08-2011 07:22 PM

Our police vehicles are serviced by the hours in use, not the miles driven here.

powersof12 01-08-2012 11:47 AM

The dealer pulled my factory GMC 5.3L plugs at 100,000 (when I had all the fluids changed) and they said the plugs looked perfect and no need to change. Check again at 125,000. I was not thrilled with the idea of changing 16 plugs every 30,000 in the Hemi and in fact, there is no way I am going to. I will push it to 50,000 since I drive easy and highway all the time.

BIG HORNS 01-11-2012 02:20 AM

Hello from the great white north, just ran into a guy here who does mostly highway and just changed plugs in his 09 at 59,000 miles, I for one, will be looking to get 50k+ outta my plugs. Cheers and good luck. JIM

Ram2300 04-24-2012 12:56 AM

How is there 16 plugs in our trucks when there r only 8 cylinders? I's this only a dodge thing or somethin cuz my past GM trucks only had 1 per cylinder which was 8 plugs.

AirborneSilva 04-24-2012 07:56 AM


Originally Posted by Ram2300 (Post 783718)
How is there 16 plugs in our trucks when there r only 8 cylinders? I's this only a dodge thing or somethin cuz my past GM trucks only had 1 per cylinder which was 8 plugs.

So it will pass the retarded smog laws

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