Packard Motor Car Information

Re: Need spark plug explanation....AC 103 vs AC 103S vs Champ UY6

Posted by PackardV8 On 2014/8/9 17:53:57

AC 103S:
The "10" means 10mm. "3" indicates a rather cold plug. "S" indicates extended tip OR (7/8") moderate long reach (23/32").

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