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Generation III Internal Engine
1997-2006 LS1 | LS6
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Old 07-03-2004, 10:19 AM   #1
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Default 422 high compression & spark plug gap?

Just wondering what spark plug gap is being used on high compression 422 cu in LS1's. Trying to track down a loss of power at high rpm's in a friend's car.

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Old 07-03-2004, 03:08 PM   #2
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I use .039 gap with 11.2-1 on a iron 422 with a 100 NX wet shot. 28 degrees of timing with no knock retard. NGK TR6 plugs.
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Old 07-03-2004, 05:00 PM   #3
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what compression ratio is it?

u may be able to run an NGK 5671A-7 or -8 in it
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Old 07-04-2004, 08:48 AM   #4
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It's about 12.5:1, no nitrous.

Thanks for the replys,
Brian
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Old 07-04-2004, 01:44 PM   #5
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Try a TR6 @ at the factory .035 gap.
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Old 07-04-2004, 01:44 PM
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compresser, compression, gap, high, lots, ls1, lt1, na, ngk, plug, plugs, racing, recommended, spark, tr6


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