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Pete · 01-17-2022, 08:15 PM

Something that is seldom noted but essential on race engines only is, a sparkplug thread insert of any kind will normally change the plug range one notch.

01-17-2022, 08:15 PM	#10
Pete BANNED Join Date: May 2010 Location: Wa. Posts: 5,423	Re: Flathead Spark plug Thread Repair Something that is seldom noted but essential on race engines only is, a sparkplug thread insert of any kind will normally change the plug range one notch.