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NGK Spark Plugs

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09-21-2008, 11:00 PM

Unreal

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Join Date: May 2000

Location: Chattanooga, TN, USA

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Re: NGK Spark Plugs

Just called Advanced, and they listed the GR5 for an L72, and have them in stock. Since I dropped my compression to 9.75 to run on pump gas, do I need to go to one range hotter? Would that be GR4?

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