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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Spark Plug Brand and Gap?

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Old 10-06-2008, 01:19 AM
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Default Spark Plug Brand and Gap?
Okay i have a MSD blaster coil, farely new OPTI , and the mods listed below and i wanted to change my plugs and wanted to know which brand to go with and also i know the stock Gap is .050. should it be gapped differently with my mods? mid length headers, full exhaust, intake.
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Old 10-06-2008, 08:18 AM
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Yep you should close that gap some...NGK TR55s is what most guys run (same here). Its a stock heat plug, do a search lots of info about them.
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Old 10-06-2008, 01:10 PM
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Ngk tr-55 gapped at .40ish!
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Old 10-06-2008, 01:36 PM
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NGK TR-55s or Stock Delcos.
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Old 10-06-2008, 11:41 PM
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anyone else? .040 Gap? any more suggestions!
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Old 10-06-2008, 11:45 PM
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I use NGK TR6's gapped at .035. Good for nitrous
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Old 10-07-2008, 01:03 AM
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I was running the TR55s in mine @ .050" for awhile, now i've installed some TR6s gapped @ .035", car runs great with both sets.
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Old 10-07-2008, 01:19 AM
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what does the difference in the gap Do?
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