Re: AC 43LS Spark plugs

Posted by PackardV8 On 2007/4/17 21:28:46

Someone wrote : "Autolite's site is among the easiest to use, and for my 56 Packard they recommend Autolite 66 for a non-resistor plug ...".

I can not find an AL site. HOWEVER, i went to a local CarQuest store and viewed the AL book with my own eyes and at my own hand. it said:
Plugs with a WXYZ numeric code (on the plug) then the last number (Z) is the heat range, 4 cold, 5 mid-temp, 6 HOT. The number, next but one from the last, (Y), indicates RESISTOR/SUPPRESSION. EVEN numbers are resistor/supression (-10 for non-resistor) and odd numbers are NOT resistor/supression (+10 for resistor). The first 2wo numbers (WX) indicate a plug "group family" such as thread, hex size, reach etc.
SO, the 66 is a RESISTOR plug and the 56 is a regular plug. I have seen the 56 and 66 reported as above and in reverse. This has been a major source of confusion for me.
DOES THE AL WEB SITE contradict the above info i have relayed??? I have 66 in my 56 Executive.