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

My Plug Gap?

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Old Sep 13, 2007 | 02:51 PM
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Default My Plug Gap?

Well Iv seen with around 400 hp and MSD ignition 35-40? was leaning towards 35..

these are NGK TR55
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Old Sep 13, 2007 | 06:51 PM
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My very qualified tuner prefers and recommends between .030 to .035 for plug gaps. I had mine at .035 and now he wants me to go down to .030 on my next set.
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Old Sep 13, 2007 | 11:23 PM
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ya I was thinking .35 for now and next set .30 and if i notice a bad/good diff go back or not
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Old Sep 22, 2007 | 08:20 PM
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Originally Posted by Puck
My very qualified tuner prefers and recommends between .030 to .035 for plug gaps. I had mine at .035 and now he wants me to go down to .030 on my next set.
whats ur ignition

i got a 6AL, MSD wires, MSD Coil and MSD Pro Opti so i know im juicin it alittle more then stock
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Old Sep 22, 2007 | 08:25 PM
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Originally Posted by Gun5
whats ur ignition

i got a 6AL, MSD wires, MSD Coil and MSD Pro Opti so i know im juicin it alittle more then stock
OEM opti unit with MSD cap and rotor, MSD "Blaster" coil, and Taylor Thundervolt wires w/ tr55 plugs.
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Old Sep 22, 2007 | 08:44 PM
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Originally Posted by Puck
OEM opti unit with MSD cap and rotor, MSD "Blaster" coil, and Taylor Thundervolt wires w/ tr55 plugs.
from what I hear any kind of after market box raises the gap about .5 because they juice it that much more like i said i was leaning toward .35 maybe
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Old Sep 22, 2007 | 09:03 PM
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Stock coil puts out more in the higher Rs than the MSD ones
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Old Sep 22, 2007 | 09:09 PM
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yea I would do .035 unless you are forced induction or nitrous
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Old Sep 22, 2007 | 09:22 PM
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Originally Posted by procharged355
yea I would do .035 unless you are forced induction or nitrous
This dude says .050 unless you're running FI or NOS. Then you go .035

https://ls1tech.com/forums/showpost....21&postcount=1
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Old Sep 23, 2007 | 12:59 AM
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hmm i sent him a msg
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Old Sep 23, 2007 | 07:34 AM
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Mine are set at .050" and I dont have N2O.

What is the reason you guys are going to .035" when OE spec is .050"?
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Old Sep 23, 2007 | 08:38 AM
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Originally Posted by Gun5
from what I hear any kind of after market box raises the gap about .5 because they juice it that much more like i said i was leaning toward .35 maybe
...yea, and then higher compression and rpms is supposed to make the cap go down again. Those rules are way back from standard SBC days, and the LT1 behaves a bit different.

The OEM specs arent always geared towards max power - hence the very modest timing and running pig rich from the factory. In most N/A high performance LT1s, especially in the higher rpms, you get more power and smoother response from a smaller gap in the .030-.035 range. The bigger stock gap tends to "wash out" under high compression and high rpms.

Then again, what credentials does my tuner have - besides being a personal friend of Ed Wright and working as a Chevrolet engineer since before most of us were born, and tuning hundreds and hundreds of TPIs and LT1s in the process .

I gained 35 to the wheels over a professional mail order tune with him.
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