OEM Spark Plugs

I've seen a number of the posts about spark plugs and am still wondering how the conclusion was drawn about the use of Autolite AN7 vs. Champion J-8 plugs.  I see that the '45 Parts List is not specific but has the A-538 part number indicating it was the same as the MB.  The '49 Parts List lists two plugs, the Champion and the Autolite, 638647 and 646808, respectively.  I saw the assertion by Sean that the Autolite was original and that all the manuals through 1953 or so called for the Autolite plug.  Since I don't have the '47 Parts List and see that my reprint of the '49 List seems to contradict Sean's assertion, I'm looking for more information about correct plugs - not as replacement parts but as shipped by the Willys.

Thanks.  I conclude that the earliest 2As shipped with Autolite plugs.  Do we know if 2As ever shipped with Champion plugs?

  Seems I recall reading somewhere that J.N. Willys acquired Auto-Lite around the same time that he bought Overland. Only natural that they would use Auto-Lite plugs. In '53(?) WO was bought by Kaiser, maybe he didn't get Auto-Lite in the deal? Hence the Champions.      BW

sean wrote: Sam: I saw the assertion by Sean that the Autolite was original and that all the manuals through 1953 or so called for the Autolite plug.  Since I don't have the '47 Parts List and see that my reprint of the '49 List seems to contradict Sean's assertion No contradiction.  I wasn't referring to "parts lists", but to the various "service" manuals (maintenance/mechanics/service/owners/operators manuals, etc.). Listed specifically for CJ2A: 1945 Salemans handbook:  Auto-Lite AN7 1945 Maintenance Manual: Auto-Lite AN7 1948 Mechanics Manual: Auto-Lite AN7 1953 Mechanics Manual: Auto-Lite AN7 1954 Auto-Lite master list: Auto-Lite A7 1961 Popular Parts List: Autolite or Champion (no OEM numbers) 1965 Service Manual: Champion J-8 The Champion J-8 was used earlier in other models.  The '53 Mechanics manual calls for J-8 in models 473, 475 and 685SW Remembering that the '49 parts list also covered early CJ3A, and that it's a list of "service" parts, not necessarily "assembly line" parts, there's 2 possibilities: the J-8 was possibly used on late production CJ2A, or ... the J-8 was simply offered as an alternate service part not enough info to say for sure. That's a nice looking set of vintage J-8s you have.  Any idea how old they are? Sean

Alex D. wrote: So......... The Auto-Lite AN-7 is listed for the 2-A between 1945 and 1953. In 1954 Auto-Lite list the A-7 as the plug for the 2-A. What is the difference between the AN-7 and the A-7 ?   Is it the heat range or just a newer version?

My opinion is that a J-10 is not likely an original plug if only because, as I understand Champion's numbering scheme, the higher the number, the warmer the plug.  In all the info I have seen, the J-8 is the equivalent in heat range to the Auto-Lite AN7 (not just in Willys pubs, but in general).  The AN7 was surely used early in production, and the J-8 was listed along with the AN7 as interchangeable replacement parts in the '49 Parts List. 

 Thanks for the info...I have J-8 s  ..I will put them in and see what happens as  the motor is running ..