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

Posted by PackardV8 On 2014/8/9 18:05:12

According to my amatuer study the Autolite 3136 is a hot plug "6". Non-resistor because of the second "3".
I would much prefer the hotter heat range plug unless i planned to start pulling airstream trailers thru the desert. In which case the colder AC 103S might be better.