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

What spark plugs to run?

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Old Jun 3, 2010 | 07:36 PM
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SPRAYED Z's Avatar
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Default What spark plugs to run?
Bone stock lt1 with impala head gaskets and a cam only 226-234 110lsa with full bolt ons except t.b. 3600 stall and 3.73 gear. What plugs are you guys using and whats the best for this setup?
thanks guys
Last edited by SPRAYED Z; Jun 4, 2010 at 01:12 AM.
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Old Jun 3, 2010 | 07:48 PM
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NGK TR55s would be fine at .050", IMO.
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Old Jun 3, 2010 | 08:10 PM
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Yup TR55's if no nitrous.

TR6 for a small shot

BR7EF for 150+

JMO
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Old Jun 3, 2010 | 09:33 PM
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id say tr55s at .055" IMO
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Old Jun 3, 2010 | 09:34 PM
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Originally Posted by robsquikz28
id say tr55s at .055" IMO
Why would you use a wider gap than stock?
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Old Jun 4, 2010 | 01:08 AM
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I meant to say 45, I remember him stating in another thread he had impala head gaskets. It raises the compression so he could use 45 rather than 50.
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Old Jun 4, 2010 | 01:11 AM
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Sorry I forgot that in the post. I do have impala head gaskets.
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Old Jun 4, 2010 | 10:42 AM
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this is what bryan at pcmforless told me to run on my 200cc AI 383 with 12:1 compression

Autolite 104 plugs with the gap around .040 to .045 (slightly closed up due to the high compression)
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Old Jun 4, 2010 | 10:48 AM
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I have had great luck with Autolite AP 605 from Walmart (cheap) gapped at .045
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