Spark plug question

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04-26-2019 | 11:29 PM

myUserName

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From: south central LouisianA

Spark plug question

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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05-01-2019 | 08:18 PM

99 Black Bird T/A

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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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05-02-2019 | 08:14 AM

myUserName

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Thank you, sir!

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05-03-2019 | 05:24 PM

rednari2

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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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05-05-2019 | 09:01 PM

Chris25

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Tr6 at .045 gap works well for me.

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05-05-2019 | 11:18 PM

myUserName

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Thanks, Red and Chris!

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