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best spark plug

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Old 09-05-2012, 08:48 AM
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What's your opinion on the best plugs for the ls4?
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Old 09-05-2012, 10:07 AM
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Old 09-05-2012, 10:11 AM
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You are a man of many words...do you have the ac delco p/n
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Old 09-05-2012, 02:27 PM
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x2 on stock recommended.

Part# in my owners manual is GM part# 12571164 or AC Delco part# 41-985. Hope this helps.
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Old 09-05-2012, 05:39 PM
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Ngk..
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Old 09-05-2012, 06:31 PM
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Plane Jane NGK TR5. I'm just not a fan of expensive spark plugs...


...Snake oil.
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Old 09-05-2012, 06:46 PM
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Stock plugs are fine the street if they are changed before 100k. For racing go with ngk tr55 and do not use platinum.
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Old 09-05-2012, 08:33 PM
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Thanks folks.
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Old 09-05-2012, 08:38 PM
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Ngk /thread.
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Old 09-06-2012, 08:28 AM
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stock x3
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Old 09-06-2012, 08:45 AM
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i thought everyone liked running a cooler plug?
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Old 09-06-2012, 11:22 AM
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Yea **** man the xp103's knocked out my kr issue compared to stock
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