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Spark Plugs

Old Feb 28, 2016 | 12:10 AM
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Default Spark Plugs

What spark plug do recommend for the 2004 5.7 Hemi?
 
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Old Feb 28, 2016 | 01:09 AM
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Stock copper plugs.
 
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Old Feb 28, 2016 | 09:56 AM
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Originally Posted by Chet Ubetcha
Stock copper plugs.
This. Whatever came OEM.
 
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Old Jul 19, 2025 | 06:55 AM
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Many thanks for all the replies.
Champion or NGK's ? OEM is Champion i believe, seen some folks saying NGK's are better ? Just curious.
Thanks again ! 😁
 
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Old Jul 19, 2025 | 09:03 AM
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Not a fan of Champion..... Go with the NGK's.
 
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Old Jul 19, 2025 | 09:28 PM
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Originally Posted by HeyYou
Not a fan of Champion..... Go with the NGK's.
NGK is always good. Used them for multiple vehicles.
 
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Old Jul 20, 2025 | 11:19 AM
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Any thoughts on, if the truck should be cold, or up to temp before you start ? Thanks for the advice ! Its hard enough running one of these over in the UK with our rip off Government ! Dont want to be doing it twice ! Apart from the awkward ones next too the Servo, am looking forward to doing this !! Couple of pics of my daily !!

 
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Old Jul 20, 2025 | 11:43 AM
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Nice lookin' truck.

Warm engine makes the plugs a bit easier to get out, but, some things in there are friggin HOT! So, there is a bit of a 'danger level' there... But, so long as you are ware, and careful, it's not to bad.
 
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Old Jul 20, 2025 | 12:09 PM
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The last two cars I've done plugs on were cold from sitting overnight. My fear is always that metal expands when hot and if you over tighten the spark plugs and the engine cools down after, it could cause issues. In other words be cautious with a hot motor.
 
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Old Jul 20, 2025 | 12:41 PM
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Originally Posted by Alex Medeiros
The last two cars I've done plugs on were cold from sitting overnight. My fear is always that metal expands when hot and if you over tighten the spark plugs and the engine cools down after, it could cause issues. In other words be cautious with a hot motor.
Yep, especially when dealing with dissimilar metals.... Steel plugs, aluminum heads...... Might be best done when cold.......
 
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