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Spark plug question

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Old 04-26-2019, 10:29 PM
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Rebuilding a 383 LS1. It will have 11:1 CR. No power adder. What heat range and gap has anyone used with this please?
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Old 05-01-2019, 07:18 PM
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Originally Posted by myUserName
Rebuilding a 383 LS1. It will have 11:1 CR. No power adder. What heat range and gap has anyone used with this please?
NGK TR-55 @ .050 or .045 is popular after GM revised gap from .060 to .045 many years ago.

My LS1 383 w/11.3 to 1 CR, NGK TR-6 @ .045 works great.
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Old 05-02-2019, 07:14 AM
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Thank you, sir!
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Old 05-03-2019, 04:24 PM
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I use 5245 Autolites set at .40. For hotter motors, FI, or high compression use a 5243.
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Old 05-05-2019, 08:01 PM
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Tr6 at .045 gap works well for me.
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Old 05-05-2019, 10:18 PM
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Thanks, Red and Chris!
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