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Old 05-17-2013, 05:33 PM
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Big Boi Big Boi is offline
Dodge Ram Forum Junior Member
 
Join Date: Jun 2011
Location: S. Fla
Age: 31
Posts: 40
Gender: Male
Vehicle: 09 Hemi 1500
Trim Level: BigHorn
Color: Silver
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 0
Rep:10
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These engines run best on the oem replacements. My Hemi took 16 plugs (NGK SPLZFR5C-11). I cant say weather the plugs made a difference, because I installed my header's, and K&N CAI at the same time. Truck had just under 40k miles at the time.

Rule of thumb is to change plugs around 30k mils, or when the manual states.
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