Quote:
Originally Posted by Jeffvette
NGK #7164
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Jeff didn't elaborate much, Doc...He must have had a date
. NGK 7164 is the stock number & the 'Proper' way to order. TR55IX is the more commonly talked about 'List' number. This 'list' number is how the plug is broken down, each didget has a meaning, where the stock number is just a stock number. Same plug, just different ways to order it.