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Spark plugs

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Old Dec 23, 2025 | 05:20 PM
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Doug G
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Default Spark plugs
Stupid question I'm sure.

Are all the LS engines the same as far as reach/size plugs...not accounting for heat ranges.

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Old Feb 3, 2026 | 01:28 PM
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Gen3 and Gen 4 LS engines share common spark plug thread: Diameter 14mm-1.25mm pitch, and reach 17mm
I use TR55 in all my stock compression applications: LM7,LQ4, LQ9
TR6 in Supercharged LR4
BR7ef in Turbocharged LM7
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