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myUserName

04-26-2019 10:29 PM

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?

99 Black Bird T/A

05-01-2019 07:18 PM

Quote:

Originally Posted by myUserName (Post 20086833)

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.

myUserName

05-02-2019 07:14 AM

Thank you, sir!

rednari2

05-03-2019 04:24 PM

I use 5245 Autolites set at .40. For hotter motors, FI, or high compression use a 5243.

Chris25

05-05-2019 08:01 PM

Tr6 at .045 gap works well for me.

myUserName

05-05-2019 10:18 PM

Thanks, Red and Chris!

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