NGK Spark Plugs - The Supercar Registry

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NGK Spark Plugs

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09-22-2008, 11:52 PM

Unreal

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Join Date: May 2000

Location: Chattanooga, TN, USA

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Re: NGK Spark Plugs

Well, the thread diameter was smaller, too. I figured the 5/8 must be for 14mm and the 13/16 for 18mm....not sure about that, but I know I would have needed a LOT of pipe dope to get them to seal!!

Just called Advanced, and they stock the GR4's. Thanks for your help.

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