430 LSX Forged NA 9:1 Comp NGK TR55IX what gap?

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01-14-2014, 07:16 PM

Patsy57

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430 LSX Forged NA 9:1 Comp NGK TR55IX what gap?

Hey guys running a 9:1 compression NA motor, 430 CUin all forged, 102 TB and intake full exhaust. What should I gap my Plugs at? They are the NGK TR55IX plugs

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01-15-2014, 07:28 PM

Sean At CBM

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We have seen good results at .035 on the iridium plugs. You might be fine going to .040 being NA but the boosted engines tend to start blowing the flame out over 5000rpms

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01-15-2014, 07:47 PM

turbotbirds

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Are they stock coils, does it make a difference if others are used or sourced from different vehicles?

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01-15-2014, 10:25 PM

Patsy57

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I am using stock coils. I was told .055 is the magic number for NA is this incorrect?

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01-15-2014, 11:22 PM

JakeFusion

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9:1 Compression? Why so low NA?

I'd get NGK Iridium TR55-IX and run them at the stock gap (.055" which is what GM now recommend). Or Denso Iridium IT20s.