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

Posted by Owen_Dyneto On 2014/8/8 22:35:50

I don't know the differences offhand, but I'd recommend AutoLite 3136 which should be on the shelf or available within 24 hours at any decent auto parts store. I've used them often with good results in Packards that use the 10mm plugs and it is AutoLite's current recommendation for that year & engine.

PS - UY6 is the heat range equivalent of the M8. 104 is a hotter plug intended for more local and stop/start driving.