LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Spark plugs for stock LT1

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Old 05-08-2009, 10:41 PM
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Spark plugs for stock LT1

As stated, my question is which brand spark plugs are the best for a stock LT1? I am leaning towards AC Delco, but see Autolight's name pop up alot here. Thanks
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Old 05-08-2009, 10:45 PM
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ngk tr55
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Old 05-08-2009, 10:45 PM
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autolite 103's
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Old 05-08-2009, 11:15 PM
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I've been using AC-Delco Rapidfires for years.
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Old 05-09-2009, 10:57 AM
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Originally Posted by 1eyedmaro
ngk tr55
.+1
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Old 05-09-2009, 11:03 AM
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ones you don't have to change often.
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Old 05-12-2009, 09:55 PM
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ac delco
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Old 05-13-2009, 04:47 AM
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Originally Posted by caldercay
.+1

+2 ngk tr55 been using for over a year problem free
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Old 05-13-2009, 05:52 AM
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Originally Posted by shoebox
I've been using AC-Delco Rapidfires for years.
Me too, no problems.
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Old 05-13-2009, 06:23 AM
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TR55IX....they'll outlast your car.

I had trouble with the stock AC plugs as the platinum pucks fell off, opening up the gap, making the idle rough.
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