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Discussion Starter #1 (Edited)
What heat range NGK spark plug should I run on a sbf 363, 10.75:1, brodix track 1s fully ported, air to water intercooler, with a GTX5518R turbo with 28psi between -8 to -10 thanks.
 

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I would start with a 5671A-10 and it will probably be right on the money. The 10's are probably easier to source locally too. Hope this helps.
 

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10s
 

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if its on gas autolite's are better to read
 
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