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I used the autolite platinum and they seem pretty good so far.
 

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Bosh +4 platinum think it was around 65 for 8 of them, noticed a nice increase in throttle response. Good luck
 

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But the 5.7L takes 16 - big bucks for a plug change unless you replace with copper or standard platinum.
 

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MatrixMan said:
I use NGK IX Iridium Spark Plugs.
Ditto, no issues and 15k miles so far.
 

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Same plugs as MatrixMan and jjamess. Labor was difficult. For that reason alone the longer plug life is worth it.
 
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